I'd guess months, but as I say, you're asking the wrong person, guv.
Note: this is not directed at you personally, so don't take offence.
See, it's like this: The empeg and Rio Car are discontinued. The End of Life announcement was in September 2001. Official customer support ended in May 2003.
v2.00-final was the last official release for the car player.
Anything we're given from this point is just gravy.
The car player doesn't generate any revenue for Rio, so there's no reason whatsoever to expect another software release. The guys in Cambridge are doing this for two reasons:
1) Out of the goodness of their hearts.
2) Because it's useful testing for the code that's gone into the Karma.
However, the Karma code is all but finished. Further testing on the empeg wouldn't be useful.
So, we're left with one motivation: because they want to.
I happen to know that Rio are very good at keeping the guys busy -- I'm not sure what they're working on at the moment, but the last time I went up to Cambridge (a couple of weeks ago), everybody was working their socks off. On something that generates revenue.
So, my advice: stop asking. I can't speak for the guys still in Cambridge, but I used to find it irritating -- I wanted to get another v3.0 out, but there was nothing I could do about it. There's nothing that they can do about it (even Rob's hands are tied by schedules).
You'll get the next version of v3.0 just as quickly: when it's ready.
_________________________
--
roger