Here's a good Q&A with Carlos Correa from MiLB.com! Within the link, you'll find that Correa has been working on his speed, his explosiveness, and his agility. You'll also see that he thinks he can stick at SS, and isn't interested in shifting to 3B.
People think I'm an average runner and I want to play shortstop. I think
I'll be able to stick there, so I'm working to be more athletic,
faster, be more agile and not have to move to third.
It's also interesting to note that Correa would like to start 2014 at Corpus, not Lancaster (which I wholly support, if that matters at all).
They haven't talked to me directly, but my goal is to
go out and make the Double-A team. They'll make the decision, but I've
prepared myself and I want to show them how I have improved my skills,
so I'll do my best. But that's my goal: Double-A.