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They've announced he will be exclusively in relief, so he's competing with Jimenez, Paredes, French-and-Olson-upon-Failing-to-Make-the-Rotation and We-Just-Won't-Have-a-Lefty-in-the-Pen (last year's winner, if I recall).
Laffey claims he can hit 92 or 93 if used only in relief (if I'm reading Baker right). Hasn't done it in the past because of being moved back and forth, he says.
Dave Cameron is rather more optimistic, so long as Laffey doesn't face many RH batters. His K/BB is 2.23 vs. LH and 0.90 and getting worse vs. RH. Mostly because the slider is a real weapon against LH but not RH.
And, ghost, I think he is a groundball specialist.