The A320's currently only have single lane slides. They can, however, accommodate slide rafts inside the doors just like AN used to.
Cabin & Tech Crew would need to do a 2-day conversion course (approx) to cover the use of survival kits, how to use slide rafts, etc.
I heard from the rumour mill that ETOPS was scheduled for November start up...but that could all change now, couldn't it?