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Not yet, but I've heard several reports of him botching multiple plays at 3B over at LL and Geoff Baker. He'll likely get better with time, but will he be 100% by April? Unlikely.
This is just the Lopez to 3rd side of it.. no reports on Figgins to 2B (which I think is an even bigger deal).
So you're making a short-term position switch that will likely cost you defensive runs in 2010 and potential offensive swoons for both players (if they aren't in the right mindset, overworked dealing with new postions, and/or less focus on O).
I just have to wonder what the whole point of this is, if its not going to improve the team defensively.