>ADVs dubbing cannot handle pronounciation properly...
Well, since they're not dubbing it, it shouldn't be a problem. They're releasing it subbed-only.
Originally, they were going to dub it and release it in the usual singles with an optional artbox, with the first volume due in April, but economic and/or financial considerations have led to them nixing the dubbing and releasing it as two half-season sets instead, and bumping up the release of the first set to early March.
ADV's dubbing used to be better than it recently has been. Until 2005 or so I would have considered them the best dubbing studio, but now that honor probably goes to FUNi (who used to be among the worst) or to Bang Zoom! Entertainment.
>I personally would like to see them bring a bunch of 17-18 year olds on for the main chars and adult types for the supporting chars.
Using young actors to play young characters has had mixed results, when it's been tried in the past. I suspect that's partly because the talent pool of young voice actors is much smaller here than in Japan.