I'm new to BBEdit... always used the free versions, but I needed some clipping and other options. Anyway, I love it, but I wonder: the pop-up word completions... is there a WordPress-specific library for that out there?
BBEdit 9 has only been out for a short while and this was the first version to have the auto-completion so you won't likely find anything.
I have BBEdit 9, and love it! Yes, you can do WordPress files. I did it for a Website of mine in my signature.