While this is totally exciting news, this is better suited to your journal as it doesn't start a discussion. (You may want to look at #TheShelfLife, by the way). If you would like to talk about your experiences with publishing or answer questions, you can start a thread focused on discussion although there is currently an active topic about all things publishing-related - [link]
Congrats! Small publishers can be wonderful! My first novella was published through a small publisher and they worked very closely with me and my agent to get my book ready for the release date. I'm sure your publishers and agent will do the same.
I wish you the best of luck through the whole process! It takes a long while and a lot of work, but it's going to be worth it in the end
I have a question, maybe three: Why would people be interested in a book that doesn't exist? Did you get any 'fans' who don't know you? Does that sort of Facebook thing really help? Is the promotional proposal something you work on with your agent?