2 years is a long time to tie up money for most, but if you want, you could expect this from a stock like that
having a release date is good yes, but now what? You will see a slow decline until that next bit of big news comes along, like cast names, production start dates, etc. Until that first bit of big news breaks, stock will hold steady to slow decline. Then once the big news starts happening, you will see slight but steady increase until approx a 6-9 months before release. then stock will start jumping.
i wouldnt expect big news for a while, so you could get out, but be prepared to get back in fast just before that first big news hits. for a film out in summer 2014, big news like casting might come out late this year tho an expert might know better.