According to Logitech, since they have no information from Sony, none of their current Remotes will work with the PS4. The Ultimate and Smart Control, being bluetooth, will probably need a software update to make them compatible. The remainder, 900 included, will probably need a new adapter. These are good financial times for the makers of accessories.
The PS3 is a superior Entertainment console, to the PS4, possessing DLNA & mp3 capability among other things. I don't even know if the PS4 is able to play avi, mp4 or other video files from external HD.
For the hard core gamer the PS4 is a superior machine. But, since there are no "wow" games available at launch I find no rush to buy.