The DCI has made a Magic: The Gathering Floor Rule update which affects all tournaments run in the Two-Headed Giant format. Effective immediately, the starting life totals in Two-Headed Giant will be 30 life (instead of the previous 40 life). This change is being made to address the problem of long round times and games which tend to bog down. This change will be in affect for the upcoming Two-Headed Giant State Championships, Grand Prix-Amsterdam, Grand Prix-Massachusetts, and the Pro Tour-San Diego Qualifier round. After these tournaments have been run, the DCI and R&D will evaluate feedback with an eye towards making this a permanent change.
The complete Magic Floor Rules can be viewed at http://www.wizards.com/default.asp?x=dci/doccenter/home.