I'm seeing conflicting info on what exactly the CW's gonna do with the final 6 Smallville episodes. The Futon Critic is showing all six episodes running in a row from Jan. 31st to March 6th.
the futon critic - the web's best primetime television resource
Of course, that list is subject to change.
KryptonSite: Your Source For "Smallville" News And Information is showing that they are only showing three episodes, saving a couple for late March, and the season finale as unscheduled.
I guess the only thing we can count on for sure right now, is that there will be new episodes on 1/31, 2/7 and 2/14, and even that could change.