- With regard to the Cell, it's not that hard to develop for compared to for example the PS2. But it can be difficult to port badly designed legacy code. Building engines from scratch or porting well designed multi-threaded legacy code shouldn't be much of an issue.
Any work done now with regard to redesign will benefit a PS4's potential Cell follow up chip at higher clock and with more onchip processors.
- I agree it will be a Blu-Ray drive, probably faster.
- IMO the GPU actually makes things a lot easier for developers. At some things the RSX is more powerful and/or suitable and other stuff the Cell. Without RSX the PS3 would be really hard to port legacy stuff to, the RSX is designed so it can potentially being assisted by the Cell.
Better Cell, better specced GPU, more and faster RAM and more system bandwidth are the obvious tech improvements for a PS4, I hope they will innovate with something like virtual reality.
PS1 and PS2 software emulator should be done for PS3 and PS4, keeping the architecture similar could allow for native PS3 games support (for example through fine tuned "degrader" software to make sure everything runs as intended).
IMO a PS4 is a very long way off.
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