Just added to the Hasbro product site, is the second wave of Custom Kreons, featuring a mix of eras this time, as the first wave was 6 Gen1 characters.

Wave 2, which is likely to be out in the next month somewhere in the world...
Galvatron (Gen1 - originally released in the Preview Wave of Microchangers)
Jazz (Gen1 - already released in a build set)
Cliffjumper (Gen1 - already released in a build set)
Hound (Gen1 - new after years of waiting, as it was first shown a couple years ago at Toyfair)
Dreadwing (based on Gen1 Dreadwind - new)
Predaking (Beast Hunters - new)



BBTS recently took down their preorders for this second wave, so I had assumed that it had been cancelled.