A-1: There was a LR6 book listing on Amazon Germany back in the spring with a book release date listed in the early fall of this year. That book listing is still there, but now its release date is March next year. If the date could change once, then it can change again, so Adobe may not know what their target date is for LR6, and if they do, they won’t publically announce it, in case they change their mind.
A-2: Here is an example of the enhanced spot removal tool in LR5, where if you’re lucky it works like the CAF in PS:
http://helpx.adobe.com/lightroom/help/enhanced-spot-removal.html
A-3: The Adjustment Brush and Radial Filter and Gradient tools all allow applying effects to less than the entire image.
A-4: Adobe does have Chat and Phone support options available for some kinds of actual problems with installing or licensing, and these Community Forums for more general questions, like you’re asking now. I haven’t seen a support e-mail address listed anywhere.