I just found this list http://prospect361.c...innesota-twins/ and it is well done. After a little digging this seems to be done by a fantasy prospect hound that does weekly segments on XM/Sirius and he also seems to have considerable contacts throughout baseball.
His list - click on the link and you will get full scouting reports on each prospect:
The most interesting comment regarding Kepler which is something that I've mentioned before
Currently, he’s got gap-to-gap power despite his 10 home runs, but the swing is more level and lacks loft and use of his lower half. However, at 6-foot-4 and a slight 180 pounds, there is clearly physical projection and the hope that the power will eventually arrive.