i finished phase 1 of the hyjal dailies a couple days ago and now i'm working my way through phase 2. i'm not sure, but i think once i've collected a total of 300 marks and then some, i'll be able to unlock the vendors that sell the crimson lasher and hyjal bear cub.
needless to say... i've got a while to go. lol.
anyway, i'm keeping track of how many dailies are completable per day and the total number of marks you can collect each day. i'll probably post it all once i've finished all the phases. that is... if i can do it before the PTR is shut down and 4.2 is released. lol :P