Yeah, I realize that.
The last K-1 game they made, just by looking at clips I can tell it's improved. So the gameplay looks to have improved, looks like there is more fighters than usual, the graphics have improved, looks like there is lots more different attacks and combos, plus there is create a fighter. If K-1 World Grand Prix for DS is there one and only game for this year, I would like to get K-1 Grand Prix 2006. If there is a K-1 Grand Prix 2007, I think it would be an even bigger improvement and I would like to buy it. Everything they improved upon in the previous game, they could more likely than not improve again.
Watching the DS gameplay video, it doesn't look like the game has a lot of combos - Unless the person playing doesn't know how to do combos, I don't know.
Edit: Found the official site
K-1 WOLRD GP 絶対王者育成計画
Looks like there is some stupid story mode that brings the touch screen into play.