You guys sound really together. Congratulations on starting your journey from a place of love, respect, and integrity; you're already ahead!
Hubs and I experienced a similar honeymoon period when we opened our relationship. I was so happy to be able to be myself, and couldn't believe there was someone so accepting of me. Big communication boost, for sure!
If your experience follows ours, the next phase will be exhausting. You'll need to constantly communicate with everyone. They might all be good productive conversations, but it will still be draining.
Best of luck to all three of you! This poly rabbit hole is interesting, for sure.