Some very bold and overtly specific predictions/guesses/ideas:
Austria: SPÖVP (though, who knows, SPÖ-FPÖ? :shudder:)
US: Obama, Dems control both houses of congress, but likely to lose House and/or Senate in 2016 midterms.
UK: Labour, led by Ed Milliband
Germany: SPD-Greens
France: Hollande or Aubry president
Australia: Julia Gillard, I hope, or maybe Julie Bishop or someone. I do hope it's not Abbot.
Netherlands: PvdA leads centre-left government, not sure whether Cohen leads it, PVV biggest party in parliament
Spain: PP
Portugal: probably PSD (?)
Italy: Another weak government of the left, or maybe the right's gotten back in again already after yet another UDEUR 2008-like failure.
Canada: hopefully an NDP majority or minority
Sweden: Social-Democrats
New Zealand: John Key
Ireland: Enda Kenny
Greece: PASOK
Belgium: Very hard to predict, yet probably the one that's the least likely to see big changes. Yet another large, essentially centrist coalition (like just about every Belgian government ever).
Prime Minister might very well be Di Rupo (or his heir Magnette), as Flanders is low on future Prime Ministers. I could see Steven Vanackere make a good one, but he won't be leader of the CD&V any time soon, nor will they be in a position to lead a government in this decade. Bruno Tobback might be a concession to Flanders if the socialists remain the largest family in parliament, though, say, Johan Vandelanotte might be more acceptable to the rest of the political landscape. The Flemish liberals don't seem like they have that sort of talent or moderate credentials in house, though Alexander de Croo might alwaus be another Verhofstadt. I don't think the N-VA will ever actually participate in a government. Wallonia doesn't have any party appart from the PS capable of delivering an acceptable Prime Minister.
But then, if you'd have told me in 2006 that the N-VA would still exist in 2011 and would even be the largest party in Flanders, I'd have thought you very droll indeed.