I took a look at Hosmer's stats on Baseball Reference and FanGraphs, and here are some things that stood out:
* Hoz has been unlucky on line drives, but not as much as Yost claims. Yost recently said, "He’s probably hit 15-to-18 line outs." BR counts 7. Specifically, BR has Hoz 7 for 14 on line drives. Normal expected BABIP for line drives is .730, so if Hoz was getting average luck, he would still only have 3 more hits, which would still leave him batting under .200.
* Regarding line drives, BR has his line drive percent as 11%, which is a significant drop from last year's 17% (as several other folks here have pointed out). However, FG lists his line drive percent as 16.0% (with his 2011 number as 18.7%), which is a much smaller drop. Not sure which one to believe.
* According to FG, Hoz doesn't seem to be seeing a different mix of pitches than he did last year. He's seeing slightly fewer fastballs (51% vs. 54%) and slightly more changeups (15.1% vs. 12.6%), but that's about it.
* Based on BR's definitions, Hoz has a .894 OPS versus "power pitchers," but only a .277 OPS versus "finesse pitchers." Last year, his OPS only differed by .010 between the two (though it was much lower against pitchers considered in between). I'm not sure what to make of this, but this really jumped out at me.
By the way, the URL in the title's link is for the BR page. Here's the link for the FG page: http://www.fangraphs.com/statss.aspx?playerid=3516&position=1B