The PS4 is shaping up pretty well, it has quite a few good launch games coming with it as well.
My only concern is the frame rate, 30 FPS in a game such as Uncharted is perfectly fine, but in FPS it's really bothersome. [Halo 4 VS Black Ops II, Halo plays like crap compared to BOII]
The controller is moot, since I use a M+KB for everything, including my Xbox. [XIM Edge

]
I'm also curious about the whole used games issue.
As the rumors stand PS4 > Next-gen Xbox
The next Xbox is heavily rumored to revolve around the Kinect [no surprise]... which is a pile of shit and a half. It comes included with the Xbox and MUST be on at all times when you're online. MS was also granted a patent that allows the Kinect to check how many people are in the room while you're watching a movie for example, if there's too many it will shut the movie off. No thanks.