Obama isn't going to win NY or NJ and Clinton isn't going to win IL. I imagine this will end up becoming the major battleground on Super Tuesday.
Yes. Is it still the case that Calif is "all or nothing" in terms of winning delegates?
You mean winner take all? No, and it's never been that way on the Democratic side (only on the GOP side, but that's now been changed). The DNC rules require each state to use some form of proportional representation to assign delegates. CA assigns some of its delegates by congressional district (using PR w/ 15% threshold), and some of its delegates based on the total statewide vote tally (using PR w/ 15% threshold).