Milledge- I think he does have a job next year, whether it is RF or LF I have no clue.
Snelling/Jones- I think Snelling will be starting in the OF with Suzuki and Ibanez at the start of next year, and that Jones will start the year at AAA. Jones may have a better future, but until Snelling hurts himself I expect him to start in Seattle.
Guzman does have a shot to be in the rotation, but I wouldn't count on it, the Cubs could be players in the FA market this year, and have quite of few SPs anyway (Zambrano, Miller, Hill, Marshall, Prior?) who I would expect to get a shot first.
Hill- should have a rotation spot, and be an underrated, but good starter.
Garza- let someone else buy into the hype, he should start in AAA, and may or may not see any time with Minnesota (and would probably start as a reliever anyway).
Sanchez/Tata- I think both have a good chance to be with Detroit at the start of next season (though I expect at least one to start in the minors), but I wouldn't expect to see them starting immediately.
Miller is tough to gauge, he pitched well in limited appearances this year, and Leyland said all of the right stuff about him... but I'm not so sure his getting to the majors when he did wasn't just because the contract stipulated that he would be called up... I expect him to start the year in AAA, but wouldn't be too surprised to see him start the year in the Detroit pen.