The Battle Masters Fight Night pack has been found at US retail as well (it was found at a Toyworld here a couple weeks back). Not sure if this was supposed to be held back with Movie toys in May.

And the second wave of Custom Kreons have been found in Taiwan, which is mostly Gen1 characters - Galvatron, Hound, Cliffjumper, Dreadwind, Jazz, Predaking. These might end up here, as the first wave was found in one or two ToysRUs stores here.
(third wave has Movie characters, which will come out in May)