Like everyone else has pointed out, GSP should keep this standing and exploit Sheild's weak standup. My hope is that GSP will open up with all strikes, but I'd bet that he'll primarily throw his jabs and keep range for fear of getting taken down by throwing kicks. For the first couple rounds GSP should mix up his striking with a variety of takedowns to get Sheilds off balance and tire him out with GSP on top. Then he should attempt to finish Jake off, on his feet, in the latter rounds.
"Yeah, well, you know, that's just, like, your opinion, man."