Obviously no one knows for sure, but the reports seem to be coalescing around there being a deal in place but the Cubs pulled out before it was finalized, probably because they didn't like something in Haren's medical records. But can't you see his medical records before a deal if seriously discussed? It's not like he got a physical between the twitter rumors and the actual collapse. I have no idea. I always imagined that the teams just talk about player health until the deal is pretty close, then at the last minute begin to exchange formal medical histories. The alternative explanation some have floated is that the Angels at the last minute tried to extract an extra player out of the Cubs, possibly Brett Jackson, and the Cubs were so annoyed they flipped the bird and nixed the whole deal.