they actually did it under 72 hours get it straight. they didnt start the marathon exactly at 6:00 they had problems to fix at the beginning of the stream.
Games Played
They did not play Pokemon Emerald or Pokemon Platinum, and it should be added that Shadows of Almia was also briefly played to obtain Manaphy. Fixes are needed.
Next year's marathons
They actually showed the "sneak peek" trailer for the next year's marathons when they reached $5,000 in donations during the marathon, NOT after the marathon.
Pokemon Marathons
They said they will not have a new Pokemon marathon at all until more games are released(not counting HG/SS), but they said they will most likely have a Pokemon marathon when and if a new generation of Pokemon is introduced.