Movies, a different story. Also, “3D is not a focus”.
4k displays is where the future is headed, however although PS4 will support 4k movies, games won’t see that kind of resolution, as it’s still a very expensive technology, and no one wants to buy PS4 for, say $600, right? Right…
Here’s PlayStation Executive Shuhei Yoshida on the matter:
The PS4 supports 4K output, but only for photos and videos — not games, PS4 games do not work on 4K.
On 3D, in a humbling reality check by Sony, Yoshida says the technology was no longer a focus, although PS4 will provide a better quality 3D experience than its predecessor:
It’s not a focus. But it does do it better. The basic capability is higher so more games will run at 1080p at 60 frames so it’s an easier and better experience when you watch on 3D TV.
Yoshida went on about 3D, as if singing the tech’s swang song:
3D was a big thing a couple of years ago — we made it a big thing because it was lead by the consumer electronics side of Sony and we liked what we could do on PS3 using 3D stereoscopic. But now the consumer electronics side of Sony, or all of the companies have shifted focus from 3D TV to something else, so if they’re not talking about it, why would we?
PlayStation 4 is slated for a release later this year, with Killzone: Shadow Fall, amongst others, releasing alongside the machine.

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@Everyone: Did Sony say anything about the PS4 being backwards compatible?
@Alex there isn’t gonna be no hardware based backwards compatibility at all. though there will be a form of it in the cloud. we don’t know whether we will be able to use our PS1/PS2/PS3 discs on the PS4 or whether we will have to buy games all over again. we just got to wait and see.
@Ghost: Well that sucks. I would have loved to play my PS3 disks on the PS4. Damn it Sony.
disappointing, but totally expected.

4K technology is just a little out of reach still even for the extremely high end market out there!
4K games would require technology just simply not viably possible for mass markets.
for the hollywood actors with millions burning holes in their pockets, fine.
but not for us mere mortals.