Zacuto USA Announces Z-Finder EVF Electronic Viewfinder for DSLR Cameras

While they had already announced it on the web, Zacuto now has an official press release out on their upcoming EVF Electronic Viewfinder. There's nothing really new here, except that I'm trying to figure out if the sentence that begins "An upgrade path for existing Z-Finder users..."means that the Z-Finder EVF will use a slightly different Z-Finder optical unit, or does that just mean that they are going to offer existing users some kind of discount?!:

Pricing and Availability: Z-Finder EVF has a list price of $775.00. An upgrade path for existing Z-Finder users and a combo-kit (Z-Finder with EVF) will be available at a discounted price (TBD)