I don't know where that expectation came from. First Apple had the problem of repatriating international funds, so this was never going to be a $30, $50 or $100 (some crazy estimate) dividend.
Second all precedent from similar companies issuing a first dividend (well not first for Apple, but first for the 'new' Apple) such as Microsoft and Cisco is 1-2%.
I don't think the buyback will be very effective, not against the bigger dividend expectation.
1.8% is about par. I am surprised they didn't split the stock. Question now is how far the stock will fall today before picking back up again later on as yield-focused funds buy into the new action.