Walking home today I saw construction finishing on a restaurant on the north side of O'Farrell, between Leavenworth and Hyde. I also spied aluminum steamers and then stopped to ask what kind of restaurant it was and when it would open. Chinese & dim sum was his reply, opening in 2-3 weeks.
It was loud because of the construction, so I didn't continue the conversation. There's no name on the door, and they were installing a window. The dining area looked smallish and casual.
I'll report anything else I find out. I'm excited to have it, as that's one of the few things not easily available in my neighborhood.