I think having more gay characters in comics is a good thing, sure, but making someone who was previously established as straight just so they could be made gay for the sake of being gay? Not so much.
Being a straight guy myself, I can't speak for those in the LBGT community, but I'd imagine that this sort of pandering doesn't sit well for them. Personally, I always found it annoying when a character was made black or another race for the sake of them being non-white, and I'm bi-racial myself. Characters should be able to stand on their own without their gender, sexuality, or race defining them to the nth degree. Obviously, for some characters those aspects are more important than others, but still.
Then again, this is essentially an entirely new continuity, so there you go.