This is probably a dumb question, but we were at DL yesterday and we saw it right next to the First Aid Station. I've never seen it before and have never heard of it on these boards.
Yes, it is a small quiet lounge for the Make-a Wish kids during their trip to Disneyland. In order to use the lounge, you must go through your Make A Wish foundation and have them make arraingments for you (even if you're not on a Make A Wish trip). City Hall at Disneyland does not grant permission to use the lounge.