Good news! If you ordered but don't have a signed contract for the Ford F150 Lightning but are still waiting for the truck to be delivered to your dealer you are in luck as you are still eligible for the $7,500 tax credit. The only change to the existing electric vehicle credit that takes effect after August 16, 2022, and before the end of 2022 is the introduction of the North American final assembly requirement. Otherwise, the rules in effect before the enactment of the Inflation Reduction Act for the electric vehicle credit remain in effect, including the phase-out for manufacturers that have sold over 200,000 vehicles in the United States.
https://home.treasury.gov/system/files/136/EV-Tax-Credit-FAQs.pdf How does the Inflation Reduction Act modify the existing tax credit for new electric vehicles? Overall, the reforms in the Inflation Reduction Act mean that the tax credit for electric vehicles will evolve considerably over the coming months and years. However, the only change to the electric vehicle credit that takes effect immediately after the President signs the Inflation Reduction Act into law is the North America final assembly requirement.