Good question, to it's sort of like going off to college, but being able to bring your high school buddies with you.
But I don't think people actually expect any of this stuff to come over verbatim from BG to PoE. Mostly I think people are waxing nostalgic and having a bit of fun. That has been where I've been coming from, at least.
There's BG the original editions and BG the EE now. PoE needs a bit more than BG&BG2 offered to be a real success and I'm not talking here about fancier graphics.