I recently logged a call with support a similar question, although related to vvols (but that maybe what you were specifically interested in)
The response was "Vvol support is targeted for version 2.3 of the Nimble firmware, which will be available this summer."
I'm not sure if that's what you were asking, but hope this helps.
Tech Preview is a new terminology - and we give it to features or functionality that we wish to expose to end users in a test/dev environment only for kicking the tyres. Our VVOL implementation in 2.3 is designed to allow customers access to try out VVOL in a test environment, but it is not supported to implement it into production just yet. We don't foresee many customers jumping in head first with VVOLs today due to there being so many caveats to them right now, so Tech Preview is a good place for customers to build a small vSphere 6 cluster to try it out.
Hope this helps.
Nick Dyer: Thanks for the explanation on Tech Preview!
@Nathan: If you are interested in the Tech preview program please contact your Nimble Account team and we can get you started if you are interested.
Sr. Product Manager - VMware Integrations.