So for what it's worth the Flames just tweeted the following pick from this morning's skate, looks to be the retro socks/pants.
Next scheduled date for the new thirds is March 5th against Ottawa.
Be interesting to see what they roll out with on the ice that night. Could be reading too much into this, but it's not uncommon to see the matching socks/pants for an upcoming game in the practice photos.
Larger pic.