I would love if, lets say, every 3 weeks you released 1 or 2 new items/building to build/make, while also holding out for the big update.
So we get some content, from time to time and it keeps the game more interesting, while content on a very small scale should be easy (easier?) to add.
Edit: Also, gamers have a very short attention span, not having any new content for 3+ months could be bad for you guys, you want a steady flow of content, keep players coming back.