I was hanging around on neo-geo.com, checking out the latest impressions on the neogeo MVS version of gunlord. As it turns out, NG Dev Team are registered users at that site's forum, and had this to say about future projects. I imagine these are likely to be neogeo based projects like their latest three releases: Last Hope, Fast Striker, Gunlord.

We currently have these expensive projects on our kickstarter candidate list:

A run'n'gun, an action adventure like Castlevania and a beat'em'up

Currently we are already busy with two games though.
The decision needs to me made after the "Ikari" project is nearly finished.
We will make all those games anyway, it's just a question of order
And later they added:

The "Ikari" will be our first 2 player game.
I consider those games, buddy games. They are best played with 2 or more people. Same goes for the run'n'gun or beat'em'up

>How far along are you guys with the "Ikari" project?

It won't be finished before 2013. However there will be another game in 2012
Ikari is probably in reference to "Ikari Warriors" - an old popular game by SNK, creators of the neogeo platform.

Judging from NG Dev Team's interest in porting their projects to the DC so long as there is adequate demand - it could be that some of these future neogeo titles of theirs also wind up on the good old DC over the next couple years. :D