I am very interested in purchasing Virtualmin Pro, however, I am running on a FreeBSD 5 system.
My system is while somewhat customized, I think will migrate with some work to your new system (I am already running Virtualmin) without extensive work.
I am curious, if I will be able to get support if I buy it right now, however…
I also would be happy to work with your team to submit some of the "gotchas" I have observed with Webmin/Virtualmin and help with the system package utilities with FreeBSD if desired.