Really depends on the size of the league, and depth of keepers, but if we are talking dynasty league, Jeff Locke is a guy to keep tabs on IMO. Finished the year in Double-A, is a lefty but not a soft tosser. Doesn't walk anyone and posted a solid k-rate. Should have an opportunity to move up the ladder and maybe reach the bigs in the second half of next year. I read a Jim Callis chat from BA where he described him as a number 3-4 starter that he liked. I think he might have a tiny bit higher ceiling than that, maybe number 2-3. Regardless, gotta like lefties with a decent pitch mix and solid velo who don't walk batters.
Yonder Alonso seems a bit of a forgotten man thanks to being blocked by Votto. Maybe he'll prove to be a solid trade chip in the off-season. Strong finish post ASB in Triple-A .335/.416/.561 with 6 HR's in 173 AB's.
I believe Jason Motte takes over the closer gig in St. Louis in place of Ryan Franklin, so reasonable speculative closer who may be unowned in dynasty leagues. I'll say the same about Joaquin Benoit. Soriano is going to command a hefty price tag in the off-season and the Rays are looking to shed payroll. I'd take Craig Kimbrel to Jonny Venters in Atlanta if you are speculating on which guy takes over for Billy Wagner next year.
Kyle Gibson had an awesome year in the Twins farm system and ascended all the way to Triple-A in his first year, perhaps he'll have a shot to crack the Twins rotation at somepoint next year.