New features will help you to build website even more functional
In free version you can find :
? Multi language
? RTL support
? Ability to add child fields to custom fields
? Ability to select a layout for a marker preview in maps
? The ability to display dates in the Joomla calendar without regard to the year

The professional version will open for you the features

? Create Mega menu on your Joomla website
? Show any content on your site in pdf format, printing and aesly send this documents
? Create pop-up and hover windows

Read more about new features read in article - New version of website builder for joomla

All posibilities look here -  best website builder for Joomla