I spotted two(!!!) non-trial WiFi planes at PDX this morning. #457 and #458 were parked next to each other. The domes looked totally different on these two planes--more aerodynamic, kind of like a (very) mini 747 hump. They weren't the circular bubbles like the old ones have.
It's also interesting to note that I saw N644AS, Alaska's Row 44 trial plane. It still had the bubble, despite AS having selected Gogo.