Many have voiced opinions that GSP/Shields will be a boring fight, given that both fighters specialize in wrestling/grappling. However, I doubt that it will be more boring than any other GSP fight, and perhaps even more exciting than the last. I like GSP better against wrestler/grapplers than I do against strikers (see: Hardy, Alves).
GSP will bring the same strategy for Shields that he did for Koscheck, which is to keep it on the feet. He has been very vocal about his methods; he is a cerebral fighter who fights to his opponents weaknesses. He's the most well-rounded fighter in the world, so this strategy is always feasible. Whatever you suck at doing, he's awesome at doing that. He's done it for five straight title defenses without a glitch, and although I admittedly know nothing of Shield's takedown abilities or standup game, I'd be shocked if GSP's performance isn't quite similar to his last fight. He caught a bit of good fortune against Koscheck, I think, by cracking Kos's orbital very early in the fight (“good fortune”, of course, means blasting a superjab unexpectedly to your opponent's face), and in the Shields fight, I expect it to be more closely contested. The early injury to Koshcheck actually robbed the fight of any luster, and barring an injury, Shields should be able to remain competitive, even if the idea of GSP losing at WW is quite unthinkable.
But boring? What does that mean...a decision? OF COURSE it will end in a decision. It's GSP's world, and we're just living in it. But I expect it will a very interesting battle of position: Shields struggling to take it to the mat, and GSP trying to force his will and keep it on the feet.