Right, I'm not sure if everyone ended up getting the memo on this, so for starters, here's IGN's article on it.
Note CraftDinur's wall-of-text comment below.
Go on, I'll let you read it.
I'm poking around all over trying to figure out what exactly is going on, and it looks like the original devs are no longer involved with Ace Of Spades
itself. Additionally, Jagex plans on taking down the free version - and the servers along with it - ahead of their (rewritten) openGL version on Steam, referring to the free version as a prototype.
Now, from what I understand, Jagex is basically responsible for the current RuneScape
being... well, whatever it is now.