Two questions from a newbie who dont understand the relationship between the GL2 and its expansion:

1. Does the DA expansion add or change anything to the core DL game? In other words, if you plat DL, does the DA expansion have any effect on it?
2. Will the core game, DL, recieve any more patches? In other words, can I play DL, without worrying that it will need another patch?

Thanx.