It's a rather uninspiring collection of failed prospects -- Steven Pence, J.R. Towles, Aaron Thompson. If any of the three appear in Minnesota this year, it's a bad sign. This is more about the Triple A team. The Twins want to keep their Rochester affiliation, and they can't keep losing 90-plus games there.
Towles is a catcher who bombed a few years ago when handed the regular job in Houston. He has hit in the minors but not in the majors. He and Rene Rivera are likely to be the catchers for Rochester, which figures to slow the advance of Chris Herrmann and Danny Lehmann. In Herrmann's case, that may not be a terrible thing, as he has less than a season in Double A.
Joe Christensen said the Twins have 24 non-roster invitees lined up for spring training. That sounds like a lot, but about nine of them will be catchers around mainly to the the other half of the bullpen sessions for more than two dozen pitchers.