I emailed them a month back - they didnt produce any ETA's - the way it works in my limited time watching their site - they place their order with CSF - CSF sends them the replacements, but that can take months. When they say that they have them in stock - they disappear in a few days.
I've been on their subscribe list for over a year and missed out every time they became available. I even had emails and calls into them on hints of when they may be available....so, yeah, communicate w/ them as much as you can and If you're sure you want one, jump on it the literal second you get a response. I ended up getting lucky to source a new/used on from a forum member. Good luck.