[quote name='The_Spaceman']I don't know how DLC would be handled as there is no shop channel to purchase them. I guess they could use the WiiShop channel, but I don't know how it would connect with the game. Plus it would confuse people who haven't bought them game also in the WiiShop Channel.[/QUOTE]
Modern Warfare has demonstrated that a hotfix can be implemented into the game. Some of us might consider this as close to patching as you can get, and depending on how much data is required for it, it could be relegated to internal memory. So it is not impossible - if Activision, of all people, can get it done, there's no reason Capcom can't. Opening up a new mention option would take all of a bit of code and maybe a few images - very small addition - and they've done similar things with Megaman 9 DLC.
Further, "confuse people who didn't buy the game" is really stretching it.
However, I have extreme doubt this will ever come to fruition. Capcom's made some rather bizarre and contradictory noise on this front. Phoenix Wright was denounced as usable a few months ago, when they cited that "his attacks would be too big" if he yelled out OBJECTION! and sent the familiar speech bubble across the screen. I think they even intonated that he never made it past initial design stages because of this.
Within the last few weeks they talked about scrapping other characters for equally odd reasons, including Speed (Speed Racer) because "we couldn't think up a moveset, and didn't want to Captain Falcon him." So you could call that lazy or standing up for the franchise; I don't really care either way. Still an odd answer there.
This is all to say that I have huge doubt that they've got a bunch of usable character data and models sitting around waiting to be used. The only honest option here as I see it is that Nintendo agrees to it and tells Capcom to do it, and then finds a way to sell it in game stores in order to boost presence. Because I'm really doubting Capcom is going to go through the trouble unless the game sells a lot, and the consensus is that this isn't going to happen.
So at the end of the day I think this is a lot of noise on Capcom's part, but also a foregone conclusion because of Nintendo's policies and general attitude regarding DLC.