One of my players will be beside himself with glee when the monk is finally released. He has a couple characters that are waiting in the wings for the Monk class (and even a Samurai class, if that will see the light of day). So this is indeed good news.
Power source has to be Ki, interestingly enough if this falls through i suppose the pattern of PHB 1-2 will Hold for 3-4 so we can expect Psionic/Shadow/Ki Sources in PHB3 which would then be finished in PHB 4 together with Elemental.
All in all awesome all around. I cant wait for May.
i really hope they do with monk what they did with druid - basically take the class and turn it into a power source. Hence we have leader druids (shaman), controller druids (druid), and defender druids (warden).
If 'ki', as a power source, is treated as 'monk', then we can look forward to the joy of having potentially controller, striker, defender and leader monks. Name a fighting style for each role and BAM - all my Christmases will have come at once.