I think Obama's approach to foreign policy has been very clear.
I would encourage you to listen to Obama's recent foreign policy speech....
...one focus of which is that our overall foreign policy has been significantly harmed by Bush's obsession over Iraq for the last five years at the expense of Afghanistan (and the true AQ threat) and other foreign policy trouble spots and threats around the world.
And as a result, hat we need to return to broad strategic foreign policy objectives that include rebuilding relations with our allies and a return to diplomacy as a foreign policy tool (backed by threat of force when necessary as a last resort) rather than belligerent and overly aggressive rhetoric when dealing with those who are not our allies or friends.
part 1
part 2
part 3
part 4
Regarding Afghanistan, in addition to will's comments, I believe Obama's focus will be on attempting to restore a greater NATO role, including a greater US role than present...but hardly anywhere near the force level in Iraq.
But by most accounts Afghanistan is a mission impossible.
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Added:
Now can someone explain McCain's foreign policy to me?