Today’s Unity is #242, and begins the epilogue proper; #255 will be the last one. Feel free to, I dunno, make guest art, talk about the story in the forum, ask questions about things that happened previously, or whatever.
As I’ve said before, though, just because Unity (the series) will be over doesn’t mean there won’t be any more stories set in Unity (the ship). I have a few ideas banging around for other stories set in their universe, although for now I’m looking forward to working on something else for a while. Whatever I do will, of course, continue to be published right here on this very site/RSS feed/LJ syndication/whatever.