Based on the credits page, I'd guess that it depends on whether or not anyone volunteers to help out:
"I've had this translated for quite a while, but I was paranoid that the typesetting was too awful to my 'name' to. That being said, if you like the series, and you like to do a bit of ol' Photoshop, drop us an email, and we can get these chapters out a lot faster than once per year. It would be a win-win situation.
Anyway, cya next time!
GumiisLife"