His 'burial' at sea was the only option, no country would take him, not even Saudi, his country of birth. Muslim law says he must be 'buried' within 24hrs of death, so no time to negotiate alternatives. You can be sure forensic proof of it being him will surface soon, President Obama would not be able to make such a bold lie in front of the world, he is not some despotic third world leader. You can also be sure that regardless of what rational or scientific evidence is presented to the people, there will be some element who will shout 'conspiracy'. (not aimed at you wendy).
Personally I cant see that a figure heads death will make much difference to Al-queda, much the same as the various assassinations of American presidents hasn't ended the American way, there are others waiting to fill his sandals, such is human nature.
But yes, I would say, judging from Al-quedas previous behaviour, that there will be a price to pay for this. This price we must be willing to pay to eliminate his kind.