This is all from what I have heard and watched from Tigers Weekly, pre-game, etc:
A week ago, around August 9-10, Zumaya was throwing fastballs around 100 mph again. He was going to try and throw some curveballs soon. So, it sounds like if his finger can withstand curveballs (which he hasn't throw any of since he has been out), he will be back soon. During games, I have seen him high-fiving with his right hand, too, so I'm guessing that is a good sign!
As for Todd Jones - he IS the Tigers closer for the rest of this season. Even if he puts runners on base, he still records saves and makes WAY too much money for the Tigers to have him in middle relief. I'm sure you'll read articles saying the same things as I have said.
Anyway, that from a Tigers fan that hears/sees tidbits on TV.
P.S. They BETTER not give away Cameron Maybin