The latest for both dealerships (Desert European and Newport European) is that there will be a $2,500 premium. Deposits are $1,500.
I haven't spoken to anyone at Desert European, but from what I've heard (but it's unconfirmed), Desert European has a wait list somewhere in the mid-to-high "teens" for the Elise. They are a new Lotus dealership and as I understand it, they haven't received allotment information. Newport European doesn't expect to share their allotment with Desert European.
As you've probably gathered from reading this forum, not much is "set in stone" yet, so I would expect things to change over time. But I'm posting what I've heard hearsay.