No, they're fairly standard as far as gamemode goes.
Snowycoast has two "wait for gates to open" points and the spaceship at the end, but pl_barnblitz already did the wait-to-push thing (and pl_thundermountain with the bridge in the 1st stage).
Arctic is a pretty standard koth map. It's actually been awhile since I played stoneyridge, but I don't remember any twists aside from the bomb dropping and wrecking the wooden scaffolding when you capped the last point.
I really enjoyed Haarp when I played it, and the bright, snowy mountainside aesthetic contrasts well with snowycoast/arctic/stoneridge's nighttime snow. In fact, I'm probably going overboard with snowy night in my selections here, heh.
[Edit] I may rethink my theme here a little... I'm concerned people will get fatigued if they're going from one dark snowy map to another in a rotation.