Damn that's pretty quick. Although that "Backup option" stuff has me a bit worried quite frankly. I'd love it if new devices coming with 4.2.1 could be jailbroken.
Still, a pretty good christmas gift
I'm really hoping one doesn't require blobs. I REALLY need to swap out my iPhone 4. My power button is recessed and gives next to no feedback but I don't want to swap it and risk getting an iPhone with 4.2.1 pre-installed. Sigh... it's a 50/50 chance I'm not willing to take.
I've taken it apart and fixed it and it just does it again after a day or so.