Cruzer answered correctly, I'll go more into detail.
The new CBA has a Prospect Promotion Incentive draft pick rule. If you have a player who was rookie eligible, ranked in Top 100 by at least 2 of the 3 preseason prospect rankings (ESPN, BA, MLB), makes the opening day roster and has a full year of service time, that team gets a pick after the first round if that player wins the Rookie of the Year or ranks highly in MVP voting before they hit arbitration. This is why Tork was on the MLB roster last year (and why Greene would have been if he didn't get hurt), and why the Tigers don't want to burn Colt Keith's rookie eligibility so he doesn't drop off those prospect lists. Parker Meadows is not going to be a Top 100 prospect.