it's dead, Jim.
Yup, SyFy has pulled the plug on Eureka, and it's not even going to get those six episodes of a sixth season, as they first talked about.
The whole debacle is detailed at http://insidetv.ew.com/2011/08/08/eureka-cancelled/.
Sucks. It was a fun series. Now SyFy has what left? Nothing that I can think of!