I have had a gut feeling that baby #2 is a boy from the start. In fact, I have an odd feeling that I'll have 3 little boys before a girl comes along. Anyway, DH is beyond excited and I'm very happy that DS will have a little buddy so close in age.
So, we're pretty set on a name: August. We'll probably give him DH's name as a middle name. It's Chinese and doesn't exactly flow, but it's nice to honor DH that way. So we'll have a Benjamin and an August. I've already got Benjamin saying "baby brudder".