It is my understanding that Disney has discontinued E-nights. I think they are now piloting a new program, similar to e-nights, that allows onsite resort guests to stay in the park after regular closing hours. I don't think they charge for the tickets like they used to, rather just require guests to show their resort id's.
Sounds like a nice perk for resort guests. I wish they 'd had this in place last year. We purchased e-night tickets...it would've been nice if this had been "free".
There is a post on this site somewhere regarding this new program. Someone else may have more information.
--dizneyfan