Any word on when future manga volumes are going to be released stateside?

While I have caught up with the scanlations and enjoyed them immensely, I do prefer the convenience of the GN/tankoubon format...

I just check Viz's site or Amazon every other week or so for information.

Currently, Viz only has the release date for volume 22 listed (January 19th).

Pretty much what I do, though I usually by my upcoming manga issues from a small store in San Jose as they usually get their issues 1-2 weeks before they're properly released in say Borders or Barnes & Noble. Kinokuniya also tends to sell them as soon as they receive their issues too.