Calibre, Overdrive, EPUB and Public Libraries

Since I purchased my Kindle two years ago, I have read several hundred books checked out from our public library in Kindle format

I've noticed that there are some books in the public library's collection that exist only in EPUB format.

So the fact that Amazon has announced that they are shifting away from MOBI and toward EPUB begs the question - can anyone speculate about whether Amazon will implement a means to download EPUB books from Public Libraries via schemes such as OverDrive?

Or a related question - is it possible to download the EPUB version from OverDrive/Public Libraries into Calibre, do some kind of conversion, and then export it to Kindle? If so, please explain how (in plain English for those of us who are digitheads and familiar with how Calibre and formats work).

Thanks