First post updated slightly with more information:
5) There will be a key quest as well as a requirement to have the flag for DSK3.
6) There will be a zonewide debuff that will weaken as you gain more flags in DSK3. (Having Khasva flag will negate the debuff completely)
What exactly the debuff will do has not been completely set in stone yet, however you all can anticipate that skipping DSK3 will not be in your best interest.
Also, we are looking into the 85/15 ruling for the zone. It's something I have always personally wanted to look into, but due to the set up of our guild instances have not been able to achieve. However, we will be looking into implementing it if we can find a safe/effective way to.
Still no exact ETA, but phase one is wrapping up quickly

Oh the fun you all are going to have in DSK3...
Simon says.. touch the green one! Nooooo BLIQUE NOT THE RED ONE! zomg you just got me "Vaion Touched"!