I got a priority signup email earlier, 780 euros as I needed the one day Spanish Tri licence, despite being a BTA Premium member.
Could have bought extra insurance for another 78 euros to give 75% refund up to 7 days before hand.
Interestingly in the upsell Nirvana were offering hotels at Puerto del Carmen which would imply it is staying at largely the same location?
I haven’t signed up 
can’t see it filling and for a few quid more you can probably sign up about 3 weeks in advance.