Nicholas has the advantage of familiarity with the code and easier communication with other coders…
…and a huge amount of features not quite in trunk yet!
(bspheres, ptex etc…)
The big problem to solve is performance, which halted Farstahy who’s now waiting for bmesh integration before working further…
Yes the topology will change when you sculpt. The dynamic topology make it possible to sculpt any any shape without having to worry about the underlying topology at all, that’s the beauty. Of course you’ll need some sort of re-meshing afterwards in order for the mesh to be useful in animation, but that usually the case with non-dynamic sculpting as well. Also Nicholas has already implemented an automatic re-mesh algorithm…