I just read through all information SONY gave @ GamesCom and found an interesting fact regarding the new PS3 "slim" SKU:
The new PS3 system will focus on delivering games and other entertainment content, and users will not be able to install other Operating Systems to the new PS3 system.
Why? There is no logical reason for removing the OtherOS function. Except the OtherOS contains a huge potential exploit which SONY can't fix without removing the complete function? We don't know, yet. At least the 3.0 firmware should not remove the OtherOS from the "fat" PS3 systems. The PlayStation3 originally is shipped international as computer system to save money at the toll. The only reason why it is handled as computer system is the OtherOS function.