Bitrig developer here, feel free to shoot questions!
Congratulations on the 1.0 !
Otherwise I do not have any NetBSD stuff in mind. Can't speak for our other developers though. ;)
I would love to have FreeBSD's bhyve on Bitrig. I will dedicate some time in January for that goal. DragonflyBSD is an inspiration for us, too. We have an experimental branch (smpns) for revamping the kernel for decent SMP support.
Pretty much every other major OS out there like GNU/Linux, FreeBSD and Solaris offer some sort of solution like that, but OpenBSD and co sadly do not.
Something like that would give me a good deal of motivation to switch.