Eh, just today i made a LEMIX hunter, and who are the very first two to join the unseen path? Veressa who pledges the Silver Covenant, and Halduron who pledges the Farstriders. So, there is precedence of the farstriders going beyond horde or even silvermoon political lines, like the Silver Hand included the Sunwalkers and Blood Knights.
Also, it seems Halduron is important in the unification of the elves as he was seen on the beta in bel'ameth. And then there is this NPC added in the most current beta update:
Hurried Courier <Messenger of the United Elves>
Who seems to be a farstrider by the looks of his outfit.
And, honestly, the farstriders have the biggest connection to the high elves. The windrunner sisters where high up in the farstriders, and two of them are with the alliance. A lot of the high elves stranded in outland were farstriders, rather then the magisters. Also the high elven lodges are/were first farstrider lodges.
So, i wouldn't be surprised to see the farstriders as a more neutral organization, at least concerning the faction affiliation of its members, as long as they protect quel'thalas.