A bit back RIM released a guide for WebOS developers helping them bring their WebApps to the PlayBook but it sort of glossed over Enyo in favor of straight HTML5. Now RIM has gone back and is working on updating their guide for bringing Enyo apps too since both Enyo 1.0 and 2.0 are open source. Obviously both of those frameworks are part of WebOS and hold their design styles but I have already seen a few apps successfully make the jump to the PlayBook and BlackBerry 10.
Enyo is also possible to run on BlackBerry smartphones but it really pushes the memory limits with Enyo v1.0 though you may have some luck with Enyo 2.0. Either way if you have an Enyo app and are looking for more opportunities check out this post from Tim W @RIM along with his Enyo Style Matters sample PlayBook/BB10 app.