More functionality between console and Vita, Gigabit speeds, higher Hard Drive capacity. I am really looking forward to this launch, but with rumored price tags of $400+ I may hold off. Lower the price down and add a lot to what the PS3 has already accomplished, that will make me buy. Please do not disappoint Sony. Learn the mistakes from the last launch (i.e too high of a price and much later launch than 360)
256 GB is entirely too low for storage especially given that the new model of the PS3 comes with 500 GB. Disk based backward compatibility should definately be a priority now since they're (or so the rumor says) offering so little space at launch.
In addition, hopefully the PS4 will have MUCH faster downloading times for games especially when doing so concurrently and won't have to make any further models to correct issues such as the overheating one in the PS3 launch models.
if it will have 16gb ram then this console will probably have some sick textures:) Uncharted 4 in HD++ hell yeah