Yup. She looks pretty cool in design, and I am glad they're at least not killing off Thor Odinson. He'll still be around, which I appreciate.
Of course, if you look back on Thor's history in the Marvel Universe, new people taking up the identity of Thor isn't exactly a new thing. In Thor #273 (July 1978), Roger "Red" Norvell took up the mantle of God of Thunder. Norvell was a member of a film crew who was given the power of Thor by Loki, taking advantage of Norvell's crush on Sif.
I can't help but feel that Red was intended to more closely resemble the Thor of the actual myths. Unlike the Marvel Thor, who was typically portrayed as a clean-shaven blonde, the mythical Thor was redheaded and had a beard. Anyway, Norvell goes insane with power, but after accidentally killing a friend of his, Sif is able to help him see what a monster he had become. He would eventually die fighting Jormungand, the World Serpent, in Thor's place. It turns out Red's empowerment and death were, unbeknownst to even Loki, was all part of a plan by Odin to save Thor's life from his prophesized death fighting the World Serpent in Ragnarok.
He would eventually return to life, and be the protector of Asgard for a while, even getting his own hammer, Crusher. No one knows what he's been up to lately, so he'd be a neat character to bring back.
Norvell would be the first, but not the last person to replace Thor for a while. The next would not be a mortal cameraman, but a monstrous-looking, yet noble cyborg alien. His name: Beta Ray Bill.
Big guy kind of looks a little like a demonic horse in the face, doesn't he? Anyway, Bill first appeared in Thor #337 (November 1983), the first issue of the epic Walter Simonson run. Beta Ray Bill was an alien chosen by his people, the Korbinites, to lead his people to a new homeworld. When his ship, the Skuttlebutt, approaches Earth, Thor is sent by SHIELD to investigate. Thor battles Skuttlebutt's automatic defenses, and then encounters Bill himself. The two fight, and Skuttlebutt crashes to Earth. When Bill picks up Don Blake's walking stick and strikes it on the ground in frustration, he becomes an alien-looking version of Thor, and is then brought to Asgard by Odin alongside Thor.
Bill pleads his case to Odin, claiming Mjolnir as spoils of battle, and needing its power to help him protect his people. Odin decides to have Bill and Thor fight to the death for the right to wield Mjolnir. Bill wins, but refuses to kill Thor. In the end, a compromise is made: Thor gets back Mjolnir, and Bill is given his own Uru hammer: Stormbreaker.
Bill has had many adventures in the past thirty years, and has stood as a staunch ally to the Asgardians and good friend of Thor.
In the 90s, the idea of making a new Thor persisted, and the next Thor was an architect named Eric Masterson. He first appeared in Thor #391 (May, 1988).
Masterson was a divorced single father, working as an architect in New York City, and raising his son Kevin. Kevin himself would become a legacy hero in TWO Marvel timelines, but that's a different story. Anyway, he proved himself worthy of lifting Mjolnir by helping a wounded Thor. After getting injured taking a blast meant for Thor himself, the Thunder God bonded himself to Masterson.
He became Thor for a while when the original killed Loki, and was punished for it by Odin. Masterson had a difficult time in the role, especially when it came to interacting with other heroes, who knew the original well. When Thor came back, he continued to be a hero, this time with a mace known as Thunderstrike. He would even get his own series, something Red Norvell nor Beta Ray Bill never got (To be fair, Bill did get a couple mini-series). Sadly, Masterson died purging himself of the curse of the Bloodaxe.
In my honest opinion, I have to say that I consider it not a big deal that someone else is taking up the hammer. As I have shown, it has been done before. In the cases of Bill and Eric, there were great stories involved in their taking up Mjolnir, and they became great characters and heroes in their own right.
So, I have to say I am honestly excited with the idea of a female Thor. I only wished it was a character that was more connected to Thor's mythos like Jane Foster or Sif. Heck, I'd accept Valkyrie or a resurrected Kelda (Kelda would make sense to me, as she is the Goddess of the Storm, as established in JMS's run). Having an established supporting character, especially a long-running one, take up the mantle of a hero to me is a respectful thing. It's to me why Bucky Barnes and Sam Wilson both deserve to take up the mantle of Captain America. They were good friends of Cap, and had worked with him many times.
But to be fair, Marvel has been willing to show in recent years that they have become more willing to take risks, and I feel it's been more hit than miss on their part. It has been shown that new characters taking up old names, who have no real connection to the original or last holder, CAN work. Kamala Khan, for example, had no real connection to Carol Danvers before taking up her old codename of Ms. Marvel, and it's been very well-done so far.
Essentially, I am very curious about this new Thor. I hope she does well, and I do hope the story that brings her in is a good one. I also hope she is a good character. I think she should've been introduced earlier, so we could get to know her a bit pre-Thor, though. Ah, well. Thor will get his hammer back one day. He lost it and got it back before. Until then, let's just enjoy the ride.