A couple people on MiceChat reported that Nemo Subs were open for EE
www.micechat.com/forums/showthread.php?p=1847356
Apparently on Tuesday if you came to the park at 8AM for regular hours the EE people had already built up a 2 1/2 hour line for Nemo for the regular hour guests.
Moral of the story?
1. If you have multiple EE days (because you are staying at a DLR hotel) then it may be worth doing Nemo during EE on one of those days.
2. If you have only one EE day IMO it is not worth using it just for Nemo. Ride Nemo on a non-EE day
3. For everyone else just get there early on a non-EE day and ride Nemo first thing to avoid a 2+ hour line. Do not, I repeat, do not try to ride Nemo on an EE day unless you are a DLR hotel guest