Player Frame Icons
 

I've been using (and loving) this UI for a few months, but I can't quite figure out what these icons mean:



I imagine the sword is a combat indicator, but what about the lightning bolt? And the numbers themselves?

Those are combat stats, they can be changed from the spec changer on the InfoLine. The icons are just for show, a representative of the stat. e.g Sword for Attack Power, Lightning Bolt for Haste, etc.

Ah-ha. Thanks, Gethe!