I though it was Lebensraum he was after and world domination. Oh and no Jewish people and other people he didn't like.
That was indeed what he was after long term, but his immediate Polish demands were fairly reasonable if looked at purely from a self determination perspective. The western allies (rightly) took the view that this was about power politics and something had to be done and that all this guff about self determination was so much cant (as it usually is).