There wlll be some new themes to choose from and a selector so you can choose.   The theme that comes with the software is sort of bland.

 https://www.phpbb.com/community/viewforum.php?f=681 (list of themes)

https://www.phpbb.com/community/viewforum.php?f=676 (list of mods)

What mods and themes you guys and gals like?  :D