I had read about this on happycow and decided to come by to check it out. Was here in January 2012. Here's my Dialogue on Teahouse review.
It's primarily a contemporary teahouse cafe. It's stylized with bright white and yellow and perhaps slightly more attractive to women who might come here for afternoon tea with their girlfriends and their daughters.
Food-wise, the menu is short with everything containing either butter and/or cheese. NOT a place for vegans to eat food.
Among the drinks are hot teas, flavored teas, and boba (chewy dark tapioca balls) teas. Normally made with cow milk, you can ask for boba with soymilk instead.
If you are lacto-vegetarian then you'll be able to eat here. If you are vegan, go elsewhere.
Cons: butter & cheese everything