Haven't been keeping tabs on the rule 5 but some guy over at Bucs Dugout has an amazingly thorough writeup so check it out if that crapshoot interests you. Mayo should be coming out with his list soon if he hasn't already.
Texas has a few relievers that might be of interest to some teams (Ortiz, Yan, Kelly, Tufts) while the only hitter that teams might have interest in is Joey Butler (with Chad Tracy a longshot). Nothing exciting to see here.
Daniels was quoted recently about something that we are all finally on board with: Scheppers is a bullpen arm. Right now, his below average command limits his ceiling to something other than a late inning arm. This is a critical year for the Schepp, though relievers often get it together later rather than sooner, as his command issues completely mitigate the quality of his FB and CB, which some rate as 70 pitches when they are on. If he can't put it together by mid-season one would think that a complete mechanical overhaul might be on the horizon. If his command projects no better than average at best, one has to wonder what his ceiling can be. Closer, no. Setup, big maybe. 7th inning arm, yes. Scheppers has been a real disappointment and is rated way to highly by some even after his chronic injury issues, below average command, and failure to develop a third pitch.
I've updated the ages for the 2012 roster in the sidebar and made a rough projection for each level.
Ming over at Newberg came across a MiL signing on 12/2: ~26yo MiL FA, Loogy and sidearmer, Kyle Fernandes from the Boston system. STrictly a loogy, vs LHH: 22/18/0/5/26/.217. A depth signing with the potential to help the big club a few weeks in that role in case of injury.