"6. Declaration on Article 15(5) and (6), Article 17(6) and (7) and Article 18 of the Treaty on European UnionThis pretty much rules out two persons of the same country/geographic region being among these three top posts - and also three males getting all the three jobs!
In choosing the persons called upon to hold the offices of President of the European Council, President of the Commission and High Representative of the Union for Foreign Affairs and Security Policy, due account is to be taken of the need to respect the geographical and demographic diversity of the Union and its Member States."
In my point of view, this also speaks against the re-election of Barroso before the Lisbon Treaty has been ratified, because member states would clearly limit their options for the other two top jobs by taking an early decision on Mr. B.
Now the speculations may continue...!