I expect Tom (since KK is now the COO) to build GS into a single monolithic structure. Although KK wanted fragments, Tom knows efficiency and cost can be controlled with a solid company and not various debt producing machines. Part of me thinks he'll pick the best of each sister company, sell the rest and rebuild w/ an emphasis on services and intellectual propery on their existing products.
So...which sister co will go into which? LOL. I wish I could tell you. But I see it more as a restructuring -- breaking down the barriers and rebuilding anew.