Though Burger King will likely have trans-fat-free oils later than even McDonald's, it's more difficult to get upset that they have waited so late. The chain hasn't tried to drag the process such as McDonald's does.
On the other hand, given the taste quality of Burger King's fries, they have much less to lose taste-wise with a change in oils.
This is where I get a little confused. The national timetable is late 2008, but in New York City, the chain says it will hit the July 1 deadline. What is good for New York City should be good enough for the rest of the country. And if there is a viable reason (e.g., financial, short supply of oil), we should hear it.