I saw some ui and scripting integration .Is this a step for a future cocos2dx editor ?
May be in future. It is not planned now.It is an open source project, everybody is welcome to contribute for it.
CocoShop & CocosBuilder will support both cocos2d-iphone & cocos2d-x as well. But I haven’t tested them. Riq advice them to use the same output style, at least, use .plistCocoShop http://www.cocos2d-iphone.org/forum/topic/15668CocosBuilder http://cocosbuilder.com/