PS4 - This is the one that I am most likely to buy just because it holds some of the games that I most like (games from Naughty Dog and Insomniac in particular). I am disappointed in its plan to not have backward compatibility and in the reported battery life of its controllers. I've been disappointed by the lack of motion control support by Sony in general. Basically, there's nothing that makes me want to get this system now (or even this year).
Xbox One - Xbox games have generally not been in my favorite game categories, and it seems like it will be the same for this system. I don't care about online gaming (with the exception of Starcraft), so Microsoft's superiority in this area does not impress me much. Most disturbing to me is the always-on Kinect camera; that's a little too close to 1984 for my taste.
Wii-U - Nothing really sells me on this system, at least until a fantastic Zelda game comes out for it. Unfortunately, it looks like Nintendo's support for its own system is dwindling. It's an interesting concept, but since it is basically a Wii upgraded to HD, it's currently not worth the purchase (especially considering that the Wii has been relegated to the second TV).
It looks like my video game purchases are going to be lighter than normal this year. The old systems don't have great games coming out and I don't plan on buying the new systems just yet. We'll see if a "killer" game changes that plan.