Im not sure how the tickets sold for this but the show tomorrow still has quite a few left

Probably. I just bought a ticket for Thursday this afternoon. I went for cheap, but just for the hell of it I checked every level at MetLife and all still had tickets.

Shouldn't the opening act (if that was it) have started by now?

According to a tweet, Jon's singing w/ Kings of Surburbia. So will this cut the Jovi part of the show short?

Kind of expected it. What other "Kings" could Matt be talking about? Now, this is actually a pretty peculiar situation. I don't think Jon will want to cut the Bon Jovi show short. I think it just means more Jon for all present. I also think the reason behind this could be Jon promoting his solo band a little bit before the tour comes to an end. Jon knows no rest, and even though we know/hope the band will take a little break, especially given the circumstances, it's very likely that Jon will want to do some one-off shows or whatever to keep himself busy.

Any word on what they're playing? Covers?

I would not enjoy Jon coming out on stage before the actually show to sing covers with a shit band. For me it would take away some of the magic, maybe that's just me.

Maybe he's preparing us for a future of no BJ but only Jon solo shows. ;) I couldn't believe the posts I read by Richie fans, all excited that he might be back tonight. I wanted to reach through the 'puter and thump them in the head and say "get a frickin' clue!" :|

"Special"? That sure isn't the word I'd use for this asinine idea. Jon, if your voice is up for more, how about you just play a nice long JOVI show?! Just a thought - you could include some of those songs that you never bother to play in the U.S. Now THAT would be special!

Un-****ing-believable.

Oh, I'd say it's pretty "special" alright...