Assuming that the "mark - collector's item 2012" means these smurfs will be discontinued, the list according to the Schleich website of discontinued smurfs for 2012 is
20716 - Actor smurf
20707 - Drummer smurf
20701 - Anniversary smurf
20704 - Surprise smurf
20706 - Papa smurf in tails
20702 - Party Gargamel
20703 - Party Azrael
20705 - Party smurf
and all five decade boxes
Don't think any of them are real surprises
http://www.schleich-s.com/en/action_fig ... index.html