Aion with action combat and an open skill progression system? That's a quick gloss of how testers report Revelation Online plays. But you don't have to take anyone else's word for it, as the game will be entering open beta on January 15th... in China. So you will have to muddle through not speaking the language of the game to test it. Alternately, you can start studying now and hope you have a natural gift for learning it in two months.
Steparu reports that setting up an account will work even for international players, although there is the possibility that the game will require a cell phone or some other region-lock method. Players who don't want to fuss with that can rest somewhat easier knowing that the development team is looking into US publishing deals as well, but if all goes well, you can still try the game out early next year.