As thursdaygeek asked in the comments, do you have anything in writing? With that your position will be substantially stronger.
Ideally your negotiations for a raise are based on your performance that is well documented, and so without any written intent from your former manager, you simply start negotiations all over again.
That being said, it sounds like you accepted the position under the assumption there would be a significant pay hike after a year? If you do not have anything in writing, nor do you have enough tenure to have good performance documented, you may be stuck. You could buckle down and build the stellar performance needed to merit a raise and negotiate next year. Since you were going to work a year at your current salary anyway, waiting another year should have minimal cost, and you can always start the hunt again if they don't meet your expectations.
My advice for the future is to only ever accept a position where you like the current salary offered, rather than the salary that is only verbally promised.