On another forum - it might have been gearslutz - I read a post by an Arturia rep that half-officially declared Brass dead. So I guess that means we shouldn't hope for another update. Maybe it's a licensing issue - the intellectual properties involved might belong to third parties.
It's a shame anyhow. There's a decent bit of grit and useful ugliness in Brass that I haven't been able to get from other instruments. I just bought the otherwise similar - and perhaps better overall sounding - WIVI Band from Wallander Instruments, but it's not as deep when it comes to articulations and imperfections.
So, to achieve the funky sauce of mixing a decent sampled set (I use Session Horns from NI) with, say, a top trumpet part played in Brass, I now use 32 Lives from Sound Radix. So far, Brass 2.0 is resurrected in Logic Pro X and works fine.
But I still hope that if Arturia has no intention of continuing development of Brass, they will let somebody else do it. And an official word to customers wouldn't hurt either.