Yes this and Luigi's Mansion (especially Luigi's Mansion) seem like no brainers when it comes to releaseing a sequel. Look at those sales!
Borderlands out of all the new next gen games out is the one that needs a sequel based on sales and reception, which I'm sure it will get within the next year or two. It's at 2.33 million and climbing on the 360 and had a GOTY edition released recently.
Wii Music despite getting bad reviews and laughed at by a lot of people is nearly at 3 million itself.
PS3 is obviously Heavy Rain at 1.70 million and climbing.
It's just that simple.