Some (or most) of these questions appear to be answered in a DP REVIEW article that was posted yesterday.
My understanding is that both Lightroom CC and Lightroom Classic CC will continue to be developed under the auspices of the Adobe Creative Cloud program. Lightroom CC (version 6) should have an update later this year, and both the standalone and CC versions of Lightroom 6 will no longer be supported after 2017.
Matt Kloskowski opined in a recent blog:
"The newer Lightroom CC doesn’t mean that it’s better or a better program for you if you’re a Lightroom user. It doesn’t mean your version of Lightroom is now not as good – and that you should switch because the other one is new. It’s a different program. One that was created for a different audience (the mobile/cloud based workflow). There is an audience out there for it, even if that’s not you (and right now, it’s not me by the way).
If you’re a DSLR photographer, who heavily bases their workflow and organization on folders and hard drives (like me), Lightroom CC is not the program for you. Your existing Lightroom (now Lightroom Classic) is the program you should continue to use."