In that matter, the most recent member of FnaticMSI, James 'Moutas' Moutafidis, who has been one of the top competitive team players in StarCraft: BroodWar, has written an extensive article, covering in large the various components of the 2v2 play, analysing aspects such as shared resources, shared control and spawning positions and how they affect the general gameplay.
Going through the aforementioned paragraphs, Moutas makes some comparisons with SC:BW have also been made, that throw some light on specific matters and raise discussions on the future of the team gaming. Thus, all this make the article a nice read while you are waiting for the beta to come up and crack some 2v2 bones.
Finally, you can take a parallel look at the Europe vs USA 2v2 showmatch, hosted by HD and Husky, the games of which perfectly illustrate the discussed topics and give a nice overall picture of the situation.

Links
Fnatic.com - Article
Youtube.com - HD's channel