If you are a DPS DK you don't want to accidentally start a boss in frost presence, because you will easily pull aggro.
This WA servers as a reminder to prevent this from happening.
When a DBM pull timer is started it will check if you are in a DPS spec. If you are indeed in a DPS spec but you are in FROST presence, it will pop up a reminder, to change into a DPS presence instead!
Note: Currently only works with DBM pull timer, and does not trigger with BigWigs or other addons.