It's not that I'm like "Why the heck are they making a sequel?"
It's more like "I'm going to be buying the first one, knowing that they're already going to be making a "better" one, with probably more content and customization" right from the start.
What makes you think it'd be better? Different doesn't mean better. They may add stuff you want, but they also may remove and/or change stuff from the first game that you liked. We've seen that countless times.