BiCMOS is used where you need extremely high speed. It generally consumes more power than regular cmos and costs more to manufacture. Most foundries offer BiCMOS at some process node but cost/power considerations prevent people from using them unless they really need high speed/drive.
SOI is generally faster and lower power than regular CMOS, however a couple of points are preventing it for getting into the main stream:
1. Few foundries offer the process (mainly CPU vendors AMD, IBM, etc. ... not TSMC, UMC, Chartered, etc.)
2. Current ASIC CAD tools not fully ready for SOI effects (history effect in timing, etc.)