ETA of Content
GOA: Probably sometime soon after the start of 2010. I've heard January. No big deal there.
Card packs from treasure points: Already in. Core feature of Season 4.
Ntreev USA: "Guilds will come after PREMIUM CONTENT IS FIXED."
Card packs from treasure points: Possibly if Vol 2 comes out. (Read: Never.)
I could go on and on about how much content the US version is missing, but I'll let you guys figure that out. (Protip: Compare the two sites, and you'll easily notice a difference.)