For the two of you who can't wait for the official release of the documentary reunion of a documentary, I found some "bootleg" footage of the Rockymentary Reunion on youtube. If you never saw the Rockymentary, this footage will be strange and meaningless. More information on it can be found here and here. If you have seen it (and are a fan of the Rockymentary), these six rounds (yes, to reflect the six films) should inspire you to go the distance:
They can be seen here:
Round I, Round II, Round III, Round IV, Round V, Round VI (part 1), Round VI (part 2).