I'm using twitter to keep up to date with software I like, so do many others.
Would you mind having a princexml twitter account where you post updates and news?

You can subscribe to the news forum, which will send you email when we post news. This happens infrequently, and the next announcement will be the Prince 8.1 release.

All right, it was worth a try

Will 8.1 include HTML5 support?
Can I upgrade from 7?

Prince 8.1 may include HTML5 support; since it's still experimental you might need to enable it explicitly with a special command-line argument, otherwise it will default to using the old parser. You can upgrade from a previous version of Prince by purchasing a support contract.