I assume the 3rd-party support for the PS4 will be just fine. PS4 and the next Xbox will be very similar. The main diffrence is going to be the CPU. Multiple sources reported an AMD APU for the PS4 and an IBM Chip for the Xbox. This is pretty much what 3rd-party devs wanted from Sony and they are going to get it. Ports between PC and PS4 will probably be easier this way, as it is closer to the x86 architecture. This is the main reason why most games are programmed for the Xbox360 and then ported to the PS3, it was easier to do so.
As for the PS Vita... big titles are missing or are being messed up. I really hope that The Phantom Pain turns out to be a Vita game (and yes, it is possible).