Yeah it'll be pretty cool!

Personally, Im looking forward to seeing some nice looking UI mods. The game already looks nice, but hey, some FF themed ability bars would be really cool!

Perhaps a cast bar animation that looks like the ATB system in 13?

And I know some people don't like the idea, but a damage meter will be cool. Personally, I just like to use it to see how well I'm playing a class, and how I can be more efficient.