^ Well in answer to your question:
As we found out, Garrett was the Clairvoyant, who is also part of Hydra. Ward... right now he appears to be part of Hydra as well, but part of me wonders if he shot Hand and the other 2 agents just to fool Garrett and Ward is going to do a reverse of what Hydra did with SHIELD (and be a mole). That's just my theory though. A friend of mine thinks Simmons is with Hydra but I don't know. Maybe we're both right and maybe we're both wrong. Hard to say.
It's been confirmed though Agent Maria Hill will be on another episode and not just for a brief cameo. And it's been confirmed that Nick Fury will be on for the season finale, which I TOTALLY CAN NOT WAIT FOR (I love me some Sam Jackson)!!!
Oh and next Tuesday (4/15) the new episode is on at 9pm Eastern Time, FYI.