Only American Driver in F1 Confirmed

Scott Speed, the only American driver in Formula One racing, was confirmed to be back at Team Toro Rosso for the 2007 season. This quote from Motorsports.com:
Team co-owner Gerhard Berger had reportedly raised doubts about Speed's commitment but it seems whatever the concerns were, they are now put to rest. Speed was back behind the wheel on the last day of testing at Bahrain.
I certainly thought they would not renew Speed for this year.  Will he be a better driver in 2007?