Andy said on the announce list:

"As usual with this sort of thing though, all the complexity is in the packages you have installed, so that is no promise that it would be plain sailing for you."

Having just tried, I am left with a VPS with no external networking. Looking at the launchpad bug tracker, there have been problems with this. 

I have tried one of the solutions there via logging in through the xen console without getting it to work, but it is complicated by trying this on my phone in terms of sorting it out. 

Fortunately, it wasn't doing anything much - almost no additional packages were installed - so at the moment, I have turned it off and will wait for the installer to do a fresh install. 

Ian