most likely, unless they decide on being lazy bastards and not putting any others in. i like seeing tons and tons of stages, tons and tons of characters, with tons and tons of moves. most likely there will be at least a few more, but who knows. im gonna need to find the strategy guide online, or find someone who put tons of info on the game online (character moves, combos, fatalities, the krypt guide, where are each of the things you can unlock in konquest, etc).

I vote YES.
Most likely there will be more arenas, other than what we already saw and know of.

Well Deadly Alliance had about 5 hidden stages. Some of them we had seen and some we hadn't, similarly with the stages there from the start. Id otn expect Deception will be any different. A few of the stages seen will no doubt be hidden along with a few others as well as some new stages u can play in right away. Id say at least 5 more that we havent seen.

I can almost swear that I seen Shang Tsung's Palace from MKDA in a pic. or vid. months ago and have heard nothing else of it (I remember seeing the dragon-handle stair case and a few souls in the air and I think Ermac was in it) I'm hoping that it made it!!!
The Soulnado would be an awsome death trap!!!
Also hoping to see classic: Graveyard, Elder Gods, Tomb, Reptile's Lair, Goro's Lair, Soul Chamber, and Prison Of Souls stages!!!

Hopefully yes they did make more stages we haven't seen yet. I also hope they make the death traps in the levels we didnt see something different than the ones we have seen.

Are the classic stages like the pit going to be playable in arcade mode or only in Chess Kombat?

I hope that they put in more Deadly Alliance stages with death traps!
Especialy the Acid Bath & the one where the losser is sacraficed to the sea dragon.

Just gimme my Ice Worm arena that we saw the concept art on a few months ago.If that would be the only extra one,i'd be happy.

The backgrounds from Chess were originally planned to be for there only, but have since been allowed into normal play.
As for other stages, I know that The Living Forest was confirmed to be present, and we've not seen more than one low-quality screenshot.