You can read more about it here: Pablo Dobarro reveals his master plan for sculpting
And here:
https://docs.google.com/presentation/d/1fmjdtajPzeD3ixpGIvseKMRsAzhmKC4etIE8YqacwLk/edit#slide=id.g4f96fdc4c2_1_0
I’ve been playing with it lately and it is very nice, I hope all the improvements get added into trunk eventually because they really change the sculpt experience for the better 