After the latest episode, looks like Ward is absolutely Hydra, although in his 'real' personality he does seem to genuinely care for a the team, at least a little. It's pretty clear after he kills another two SHIELD agents AND helps Garret loot The Fridge that he's not any sort of SHIELD infiltrator. (At which point, I guess we can assume that Hand is as dead as anyone gets.) Nothing he could get out of infiltrating Hydra would be worth all the goodies he helped them get, not to mention that he could have kept his "cover" perfectly [I]without[/I] leading Garret to the gravitonium. I'm also very much expecting a no holds barred throwdown between Ward and May at some point this season.
It'll be interesting to see where they go with Ward from here. And to help keep things a little more up in the air, Triplett is definitely on the plane. (Yay!)