I'm finding plently of Canthan characters in Tyria. I've done a lot of the Kryta and jungle missions in PUG's that included lvl 20 Canthan's which is nice. Also a few new (Tyrian) players too.
I don't have any Factions characters, but I'm going the other way with mine. Right now I just finished the second storyline mission (seeking the stars one) with my Prophecies necromancer. People love necros in Factions...