Personally, before the interview, I didn't even know the Build mod ever was known as anything other than New Horizons, so I wouldn't change it, as I feel like it is just TOO characteristic.I am hoping to release a Build 14 FINAL properly officially and externally by the end of the year.
Please consider adapting that one to Maelstrom as well.
Then once that is done, my thinking would be to declare our next project Build 15 (possibly with a new name altogether, because "New Horizons" was the one for 14).
This would be a good time to drop support for the old Storm 2 version altogether; and, for example, make Maelstrom the official main branch for future developments.
But, if we end up changing the name, my suggestion would be something like "Beyond The Horizons", as it somewhat carries the spirit of "New Horizons", while also indicating that it goes even further than it.