Jack Wilshere and Vladimir Weiss both spent the second half of the season with Bolton Wanderers thanks to loan deals from their parent clubs, Arsenal and Manchester City, respectively. Both are very young, and were not going to feature on clubs challenging for the league title and a Champions League spot. That statement will still be true next season, and that is what makes this interesting.
Owen Coyle has already stated that he would like to keep both players for another year.
Jack Wilshere has said he would be open to returning for another season if he cannot get into Arsenal's first team over the summer. Wilshere is very good, but he is at least a year away from starting for a team of Arsenal's caliber. I think the chances of Wilshere playing for Bolton next season are very good.
The situation is murkier where Vladimir Weiss is concerned. He was in the squad every week, and appeared in most matches, though sometimes not until very late. Two weeks ago he stated that he was very disappointed at his lack of opportunities and was looking forward to returning to Manchester City. Then he played a great second half against Stoke City and started the match against Portsmouth. Maybe he has softened his stance on returning after that.
Weiss and Lee Chung-Yong are very similar players. I am not sure if Lee is better, but he is certainly more experienced. I think his presence will probably be enough to prevent Weiss returning to The Reebok next season.