4.2 Notes

Divine Light mana cost has been increased to 35% of base mana, up from 30%.
Flash of Light mana cost has been increased to 31% of base mana, up from 27%.
Holy Light mana cost has been increased to 12% of base mana, up from 10%.
Holy Shock mana cost has been decreased to 7% of base mana, down from 8%.
Crits are now 200% instead of 150%
Illuminated Healing now stacks
- Kurn’s analysis
Walk in the Light now improves Word of Glory healing by 30%, in addition to its current effects.
Holy Light will now also heal the target of your Beacon of Light for 100% of the healing done to your target (up from 50%).
Infusion of Light: Increases the critical effect chance of your Holy Shock by 10%. In addition, your Holy Shock critical effects reduce the cast time of your next Flash of Light, Holy Light or Divine Light by 1.50 sec.
- Instant FoLs
Speed of Light now increases movement speed when Holy Radiance or Divine Protection are cast.

http://www.wowhead.com/npc=53214#comments
Turning in 20 marks unlocks Phase 2.
Phase 1 starts in Hyjal. You need 20 marks to proceed, it takes 3 days doing the dailies there.
Phase 2 involves getting 150 tokens. It takes an additional 11 days, doing four Fireland dailies and 3 dailies back in Hyjal, every day.
Then an escort quest opens up - which you apparently get to do daily. Now you get to do the 7 dailies from Phase 2, as well as 5 dailies + 2 escorts - a total of 14 dailies in Phase 2 and 3. Because you need an ADDITIONAL 300 marks to move to even see the vendor. This takes 12 days.
Now you have 3 NPCs visible, one being this guy. It takes 125 tokens to unlock EACH vendor, so 5 days. Per vendor.
To unlock the first vendor takes 31 days; to unlock all three takes 41 days.