Well you see it would be quite difficult for them to achieve this on the PS4 for very real reasons. The PS3 uses a custom CPU from IBM - Cell as you might have heard. The easiest way to put it is that Cell has it's own instruction sets and needs very specific coding. It won't execute much else (again, all of this is simplified).Burst6 said:I have no idea how much putting a ps3 chip in the ps4 would cost, but i imagine it would be very expensive. Isn't sony using a coding system that's not a nightmare for developers to design this time? I imagine adding hardware that lets you play ps3 games will be very expensive.
You know what would be nice though? An optional attachment that would add PS3 compatibility. Just a small box you can buy and plug into a port on the side or something.
The PS4 looks like it will be using more traditional CPU architecture. This brings it in line with a PC CPU. A CPU like this will be unable to process instructions and code aimed at a Cell CPU. This rules hardware compatibility out completely.
The only realistic solution (besides the rumor this thread revolves around) would be software emulation. That is to place something between the PS3 game and the PS4's CPU that translates the instructions to something usable. This would require an incredible amount of resources to accomplish though. The system would need to be very strong to accomplish this. A lot stronger than the rumored specs.
Unfortunately whilst an attachment in theory could hold software to achieve this, the full system specs of the PS4 would need to allow for the emulation which just isn't going to happen.
It's kind of like the whole PS2 compatibility problem with the PS3 - Only significantly worse.
(For the record, I am aware of the emotion engine emulation on the early PS3 models, but it cost Sony far too much to keep going with.)
This is all a very basic explanation but you get the idea I hope.
More On-Topic: Streaming seems to be a rather iffy solution at best. Latency would be the biggest issue. Controls will be way to slow for any sort of twitch-gameplay.
If I get a PS4, I will just be keeping the PS3 next to it.... And still use the PC more than either >.<