The top row displays information for your big CDs, including active duration, CD remaining and a 30 second CD reminder.
The bottom row covers standard 'rotational' abilities. The middle icon displays the highest priority CD/proc* depending on talents, the left icon shows information about Judgement of Light on your focus target if talent is chosen (focus Judgment macro recommended**), and the right row tracks Ilterendi, Crown Jewel of Silvermoon information if it is equipped.
Bars below show your rotational CDs. In order from top to bottom they are: Light of Dawn > Holy Shock > Bestow Faith > Holy Prism.
*Note on the recommended spells: This assumes that Light of Dawn will heal at least 2 targets, and is designed to help with efficiency in consistent damage intake situations. Healing is not as simple as following a rotation or priority system and this should be treated as nothing more than a rough guide of mana efficiency recommendations.
**/cast [@focus] Judgment