http://www.theverge.com/2013/9/3/4691652/did-google-just-leak-the-nexus-5-kitkat-video
Seems there may have been a bit of an oopsie. Reddit's pretty ablaze with discussion about it. If based off the G2, it should be a powerhouse of a phone. I just hope there will be a mini or perhaps two Nexus models as I'm not entirely stoked on a 5.2" display. 4.8" on the N4 was pretty much the maximum I'd go on a phone.
I also wouldn't mind a return of the Nexus brand to HTC. I've always liked the feel of HTC phones but I can't deal with OEM garbage or their incessant attempts at locking down the bootloader.