Hi Felix,

Thanks for your request. We are certainly in agreement that this feature would be useful as part of our system. Unfortunately at this time there is no facility to allow users to go through this preview process.

It is something that's on our roadmap and once work in this area has been completed we will of course make all our users aware of the new capabilities. However, due to the nature of our list of short term development this won't be completed soon enough for you to be able to use this feature for the new theme. 

So I'm sorry but I believe your community group is going to have to look at moving to the new theme without a preview function in this case. 

I hope this doesn't cause too many issues for you.

Regards,

Rob Denison.