So while this technically isn't a new site per se, I have updated it to use Drupal 8, so yeah.
I've hit two issues so far. Firstly the path foo didn't get upgraded correctly, so I've had to regenerate all the paths. This means, that thanks to the different patterns used all the links are now new and old links are borken.
Secondly I have hit upon this bug which means I can't use the Bootstrap theme until it's fixed if I actually want to add content.
The other things I have to sort out are: