Well, that’s an old trick, as Keith mentioned in 2014 that a 64-bit version of Scrivener (Scrivener 3 is the first 64-bit version of the app) would be out “next year” (2015).
I’m cautiously tempering my hopes for a release this year (given how iOS also had a long gestation), but not putting out the bunting quite yet.
The features mentioned in the blog posts promise some significant improvements, and it will be nice to get away from the slight clunkiness of using Scrivener 2 on High Sierra (Force Touch loveliness beckons, for example).