This has the latest implementation i know about. it would be great if the cocos2d-x devs could look into it and see if its up to date and adjust accordingly. Spriter is much more in line with ccs2d philosophy than spine, with its license requirements that chuckong doesnt even know how to handle.
Its also available on steam and cheaper than spine.
I'm going to test it myself later on, but i'm no c++ master programmer, so it would be great if someone who actually knows how the engine works in-depth, could look into it.