WINE emulates DX9/10 using OpenGL - some things are working better, some worse some do not work at all. As we yet do not have OpenGL in PS3 Linux it is too soon to discuss WINE for emulating games. Besides WINE is primarily written for x86 architectures and PowerPC is not supported (see [Register or Login to view links] ) It would require CPU emulation which I guess is not feasible performance-wise. More probable chance is porting the emulator to Linux and recompiling it for PS3 PowerPC.
Actually, CELL (or CBE) is heterogeneous CPU of PS3 consisting of Power Processor Element (PPE - Power PC core) and 8 (not 6) Synergistic Processor Elements (SPE). Linux can access 6 of those 8 cores while native software (XMB, games) are said to be able to use 7 of them.