Depending on how much money they have left over after signing the draft picks from this year that they should, and stocking up for next year's (probably) high draft pick, the Cubs will probably use that money to add some other free agents as Poodski has suggested. Looking at the 2012 free agent list, it's pretty meh, unless CC Sabathia decides to opt out and come to Chicago (kind of skeptical on both the opt-out and how good he will be going forward). The rest of the free agents are either old or they suck. If you don't get appreciably better production as projected from that free agent list you might as well save the cash and play the young guys.
Maybe try to convince Fielder that the team will be competitive in a couple years, like Washington did with Jayson Werth. That contract was pretty stupid, though.