I want to try Runescape 3 out as well. It is also amazing that this game is still free to play like Runescape 1-2 unlike other MMO like World of Warcraft.
I also expect there to be more players in Runescape 3 because you just need a modern web browser which supports HTML5 like Google Chrome, Firefox 20, and IE 9 to play the game, and no plug-in like Java or Adobe Flash is needed.