It's back on the roster for a US release in August. Currently the only available XBLive features are a high-score table and the promise of extra downloadable PDA levels. I haven't heard anything about the ability to up- and download user created PDA levels, but if it never comes to pass it'll be a massive missed opportunity.
That said, even if it means just a handful more officially produced levels, I'll probably end up buying it all over again.