Talk about an anti-climax. He briefly mentioned Egypt would respect its "international agreements" -- code for the 1979 Camp David accord with Israel. Tel Aviv and Washington might have been assured. As for the Arab street, certainly not.
Laconic Morsi may have dodged the big question. But in this volatile environment de facto controlled by the Orwellian SCAF (Supreme Council of the Armed Forces) -- the Egyptian military dictatorship apparatus -- it seems the MB wouldn't think twice about throwing the Palestinians under a slow-moving bus if that meant clinging to power.
Still, this was not enough to appease the right-wingosphere in the US -- with the usual rabid dogs pontificating about how President Barack Obama had "lost" Egypt and how the country would instantly be buried by an al-Qaeda sandstorm.
It's always important to remember that the House of Saud and the MB are extremely competitive on what is the meaning of pure Islam. Qatar's official foreign policy is to support the MB wherever possible. From the point of view of Doha, this is immense; an Islamist is now president of the key Arab nation. Every committed Islamist from the Maghreb to Benghazi, and from Tehran to Kandahar, may also have reasons to rejoice.
In parallel, the official candidate of the US, the European Union, Israel, the House of Saud and Egypt's Ancien Regime -- former Air Force general Ahmad Shafik -- had lost. So, in theory, Egypt's counter-revolution had lost. Not really. Not yet.
Only the terminally naive believe the Orwellian SCAF de facto rules Egypt without consulting Washington and the House of Saud on its every move. Before Morsi was anointed as the winner, there had to be a backroom deal -- as was reported by Ahram online. 
What the SCAF-MB deal boils down to is that Morsi was forced to agree to work "within the parameters set out by SCAF." This means the military dictatorship apparatus will essentially prevail over Morsi and over the legislative. Only after this agreement was sealed Morsi was "legitimately announced as the elected president."
Damn, we bet on the wrong horse
The White House duly congratulated Morsi -- as well as SCAF, apparently taking no sides. But Washington was very keen to stress that the Egyptian government should "continue to fulfill Egypt's role as a pillar of regional peace, security and stability"; that's code for "don't even think about renegotiating Camp David." The White House also pledged to "stand with the Egyptian people." With friends like these, the "Egyptian people" -- half of them practically starving -- may be assured of a bright future.
So arguably, from now on, Egypt may have two sets of foreign policy; the MB's and SCAF's. The balance of forces will depend on whether the MB can restore the dissolved parliament; or can draw as many votes in a second round of parliamentary elections as in the (annulled) first. There's also the fact nobody knows what kind of power an Egyptian president will wield; the new constitution has not even been written.
From Washington's point of view, whatever happens must not rock the regal dhow; blind support for whatever Israel does; barely disguised support for whatever the House of Saud and the GCC do (including harsh suppression/repression of Arab Spring installments in Saudi Arabia, Bahrain and Oman); and if anyone defies us, we'll bomb you or drone you to death.