I don't think there is a clear favourite.
My top 3, with no rank, are Spain, Brazil and Germany. (Although I think Germany has taken quite a hit with all those injuries).
Then my #4 if the above teams fail to win it is Italia.
Darkhorses - Belgium is probably the #1, then Chile (if they make it to the next round) and Colombia are pretty good.
Argentina, as per usual, lack the d to win it all.
Netherlands and France's squads are very much still in construction stages and I think we'll see them having much bigger coming out parties in Euro 2016 or World Cup 2018.
My favourite group is probably Group C as there are no clear favourites. Any team can top that group or fail miserably.
Desire: I want Spain to win it all and I want Ecuador to go as far as possible, at least get past the group stage to win it all but it'll be tough with France, Switzerland and Honduras in that group.