Re: 2014 too soon?
From looking at Zack Snyder's IMDB page, it seems he doesn't have anything else going on after 300: Rise of an Empire, which is almost finished. So he could either get started on MOS 2 now or take his time.
I've also heard that it's WB studios that wants a 2014 release. He might have different plans. Hopefully WB doesn't drop him because he wants to wait a year or two before working on MOS 2.