Interesting:
http://pc.watch.impress.co.jp/docs/2008/0929/kaigai469.htm
"Goto Hiroshige has received PSX4 spec info from Japanese developer sources who received preliminary spec from SCEI for developer feedback(whom Goto refuses to name due to NDA).
- SCEI has sent rough PSX4 spec to 3rd party developers for feed back. Based on the description, PSX4 is a Wii-tized PSX3, no more than 2X as powerful.
- SCEI wants to beat Xbox 3 to launch. 2011 is the deadline, or sooner.
- SCEI pulled all its engineers from IBM Texas, and there is no new CELL architecture being developed. PSX4 will use same CELL architecture with improvements.
- SCEI will dump XDR and use standard JEDEC memory type(GDDR3/DDR3) for main memory. "
Stolen from Neogaf.