For me, I'd rather let Finn and Rachel work things out. He and Santana are not really meant to be a couple. While Rachel and Puck, that was just a fling. I'd rather let all(Finn and Santana;Puck and Rachel) of them just stay as friends. That's just my opinion. :)
Actually, Rachel and Puck ARE the new couple. Here's what I found on the description of 'Super Bowl Episode' (Episode 11) on wikipedia.com:
"...One number has been confirmed to be duetted between new couple Rachel (Lea Michele) and Puck (Mark Salling)."
I'm sure that's what they were hinting at. Although, Glee has a way of hinting at things that are never brought up again. *COUGHCOUGHQuinnandPuckCOUGHCOUGH*
Like damonwhatever said , Puck and Rachel are new couples. As far as Finn getting with Santana, I don't see it. Santana is good at making people jealous. But she seems more like a one time hook-up girl who doesn't get tied down.
Finn loves Rachel. No matter what, he still loves her. I don't think he could be with anyone else, especially not Santana with who he felt nothing.
Rachel loves Finn and I don't think she could be with anyone else, also I don't think Puck would be with Finn's girl..