Wish you the best. However, be warned that you are going to get a LOT of flak. I'm sure you aren't like this, but there are a lot of couples who treat additions to the relationship very poorly.
I'd suggest you read up on some bad experiences from other "unicorns," so as to be able to reassure any potential when she brings up worries and concerns (things like, If the wife/husband gets jealous, will I get kicked out? Will I have to love both equally and at the same rate? Will I be forbidden from having other relationships, especially when ours is still new?).