I love that series and all, BUT. How is that much different than the previous?
different is bad. the first few were so good i just want more levels and bosses. heck, a metal slug 4.5 or some expansion would be fine for me. leave the gameplay alone, just put in a few more levels.
in actuality, i doubt it will be different. look at metal slug 4, and metal slug 1. they are not much different themselves