[rules-dev] Status of CEP Work?

I've been reading the mailing list archives and I've even checked out the temporal_rete branch from SVN. A lot of the work looks promising, and it looks like a good bit has been accomplished. What I'm trying to determine is how close Drools is to having comprehensive CEP capability. I ask because I have a project that would benefit from the performance enhancements of a Rete engine, but I can get by (in the short term) without those enhancements. From looking at the JUnits, it looks like the relational operators and time windows are still under active development? I may be able to help out (subject to the approval of my employer) if CEP is close to completion. Thanks! Matt