TwistedDAV is moving in with Twisted
The integration of TwistedDAV with Twisted is beginning to happen, beginning with a move of the TwistedDAV from my red-bean repository over to a branch in the Twisted repository.
Its module namespace will be changed from twisteddav.* to twisted.web2.dav.* and some functionality is moving from the dav submodule into web2 proper. A bunch of other work is forthcoming.