Best Buy Canada Offering $40 Off Zune 4 for Trade-In of Old MP3 Player

This offer is light on details, but the image pretty much speaks for itself: if you're in Canada and you want to save $40 off a 4 GB Zune, grab your old MP3 player and head in to any Best Buy. I wonder if this is a sign of the Zune 4 fading away, with the Zune 8 becoming the new entry-level Zune and a 16 GB Zune becoming the new high-end Zune? This is just me doing some wishful thinking of course...