When asked in a recent interview about whether or not Wayforward would consider having additional levels in the form of DLC for Mighty Flip Champs, they responded by saying:
"We could, but I think we'd rather do a sequel. It's nice to get a whole new package with new ideas."
Then, this was added:
"More levels are all well and good, but it's also "more of the same". With a service as open as DSi is, we could keep pushing the series rather than just adding on top of it. Flip Champs will be worth your cash on its own, but if we've got the time, cash, and fan support to devote more time to it, I'm with Matt on this one. We've already got some great ideas for a sequel..."