Mark Ruffalo Says No Hulk Until Avengers 2

First he said:

A lot of folks have been asking about the Next Hulk. The next time you see my Hulk it will be in the Avengers2. No plans for stand alone.
— Mark Ruffalo (@Mruff221) March 7, 2013

which was followed up by:

I am not giving up on another stand alone HULK. But it’s not in the works right now. One never knows what the future will bring.
— Mark Ruffalo (@Mruff221) March 7, 2013

The implication is that there will be no Hulk in either Captain America: The Winter Soldier, Thor: The Dark World or Iron Man 3, even though the latter had Hulkbuster armor in the trailer that just came out (see here).