I have no inside news, nor have I heard much, and am going strictly off speculation and guess-work... but I don't think Guzman will get an immediate callup. They appear to be locked into Upton at 3B, and the Rays are notorious (as has become obvious lately) for holding back prospects for service time. If Guzman comes up this year, I'd bet it's late in the year, to keep his service time low and keep ROY eligibility for next year.
Keeper leaguers should jump though, because Guzman will probably be on a quicker track in Tampa than LA, simply for position availability. And if I had to take a wild guess on who the "next David Wright" would be, I'd take a real hard look at putting my money on Guzman. Expect him to be rumored to take either SS or 3B next year (depending on Upton's defensive progress), but don't make any drastic moves for him this year until you hear good reason.