I'm gonna go out on limb here and say regardless of the changes to the 2013s, they will still be very similar skis.
I have the 2011 Blends, which are exactly the same as the 2012s, and I love them. To be honest my only main concern with the ski is the durability of the topsheet, which I believe has not been changed.
Obviously there will be a price difference between the 2012 and 2013, making me lean towards the 2012.
I have not tried the 2013s, but like I said, I believe the changes to the ski are quite small.