http://www.toontrack.com/faq/will-my-ez ... drummer-2/
Will previously released EZdrummer Libraries (EZX’s) work in EZdrummer 2
Yes. In fact, they will be optimized for EZdrummer 2 and include new graphics and effect chain presets. The EZX updates are only compatible with EZdrummer 2 and will be provided free of charge to EZdrummer 2 customers (available May 6th, 2014).