Seems like Boeing may be having some schedule problems, but seem confident can manage.
From Boeing First Qtr Earnings Report
Rollout of the first airplane is scheduled in July, first flight is targeted for late August and entry into
service is scheduled for May 2008. While risks inherent in the latter stages of major
airplane development programs remain for the 787, Boeing continues to expect the 787
will be delivered on time and in accord with its contractual obligations.
From PDF presentation
787 continues to make progress
− Won 544 firm orders since launch
− Managing weight and schedule challenges
− Rollout in July; targeting first flight in late August;
on track to make first delivery in May 2008