I've only played 1 game on the new TT map (Only played a handful on the old map).
My team consisted of Ashe/Singed/Karthus. The other team consisted of Kat/Jayce/Xin.
We lost 1 bottom tower. Then they lost 2 top towers. They then took out both top towers and our inhibitor. We then took out there top inhibitor and 1 bot tower and damaged their nexus but wasn't able to kill it off.
They then managed to destroy everything we had, I spawned with 2 of them attacking our nexus, arrowed them (I was ashe), flashed over the wall instead of walking around, killed them both (Jayce/kat). We then took the rest of their bot out, by this time Xin was hitting our nexus like OHHH NOOO. Luckily I had 3 IEs, a Sanguine Blade, and a PD. So I took their nexus out in 2 seconds.
So. Is that a comeback? ;D