Found this on wowinsider:
Repeatable BG Quest: There will be a repeatable (not Daily) quest in Patch 2.4 that will allow you to turn in marks for honor. Unfortunately, I won't be able to convert my 98 WSG marks into honor without also turning in an equivalent number from the other three BGs. Currently, the exchange rate is 1 mark from each BG for 319 honor. We'll see what happens when the quest goes live.
I imagine he will be a popular quest npc on patch day, ill be onto a full set in no time!