Jsg-
Having seen Ms. Battle perform quite often at the MET in the mid-80s, I can vouch that she was indeed NOT miked. The voice, while small, had a presence and "spin" that made it very easily audible in the house without help of amplification. The MET, to my knowledge, has only used microphones in one instance and that was for the premiere of Phillip Glass' "The Voyage".
NYCO admittedly has used "sound enhancement" due to the State Theatre's lousy accoustics (having been intended as a house primarily for ballet).
Gelb's announcement is actually part of a partnership with Lincoln Center Theatre. The press release states that "the commissions will be workshopped over the next two to five years, at which point the two companies will determine whether the works are best suited to be expanded musically for the grand stage of The Met or the more intimate setting of the Vivian Beaumont Theater."
I think the chances of any of these commissions actually playing the MET are very slim...
"When you're a gay man, you have to feel good about yourself when a urologist says, "Yeah. I pick you". - Happy Endings