From memory...
References:
https://www.congress.gov/bill/117th-congress/house-bill/5376
Federal Register :: Request Access
Cell and module manufacturing in the US gets credits (advanced manufacturing production credits)
Vehicles with final assembly in North America sold to US residents get credits (clean vehicle credit).
Vehicles leased in the US get credits (commercial vehicle credit).
1. No, also no
2. Yes, but the required percentages change each year and point of sale rebate kicks in next year
3. Yes
4. Japan is a free trade partner, but that's more important for critical materials. Module assembly in the US gets credits.
US batteries: manufacturing credit to Tesla based for cells and modules
Mexico batteries: no credit
Mexico built car: up to $7,500 at sale to consumer, if critical mineral and component criteria are satisfied. $7,500 to leasing company, if leased.