In a similar vein to the Couchbase Lite iOS project, there is now a brand new repository for Couchbase Lite Android:
The plan is that all new development will happen in this repository, and the TouchDB-Android repository will be left as-is. There have been some pull requests recently (thanks!) and one of those made it into both repositories since it got merged before the Couchbase Lite repo was created. Any new pull requests should go into the Couchbase Lite repo.
The biggest change in this new repository so far is that all of the classes, packages, and Android SDK projects have been renamed accordingly. For example, TDServer -> CBLServer. I'm planning to write up a more thorough description of the renaming and put it on a wiki page.
The sqlite file extension has not changed, it's still .touchdb.
The uri prefix has been renamed from touchdb:// -> cblite://, however this should be opaque to the application anyway.
The current plan w/ regards to the github issues is to leave the current ones on the TouchDB-Android github project, and any new issues should go into the Couchbase-Lite-Android project.