Like ct101 said, this is nowhere near finalized but nonetheless on the horizon. I imagine if/when this comes to fruition, Elon will raise the prices of the vehicles to compensate so I wouldn't go cancelling your orders just yet. Also, Biden is pro-minority and low-income, so chances are any of you with decent earnings won't be able to take advantage of it with whatever constraints he'll apply. And, nothing in the summary talks about $7k and the only income/price limits are related to pre-existing electric cars; it reads:
Sec. 402. Credit for previously-owned qualified plug-in electric drive motor vehicles (§25E). The provision creates a new refundable credit for buyers of used plug-in electric cars from date of enactment through 2026. Buyers can claim a base credit of $1,250 for the purchase of qualifying used EVs, with additional incentives for battery capacity. The credit is capped at the lesser of $2,500 credit or 30% of the sale price. To qualify for this credit, used EVs must generally meet the eligibility requirements in the existing Section 30D credit for new EVs, not exceed a sale price of $25,000, and be a model year that is at least two years earlier than the date of sale. Buyers with up to $30,000 ($60,000 for married couples filing jointly) in adjusted gross income can claim the full amount of the credit. The credit phases out so that buyers with below $40,000 ($70,000 for married couples filing a joint return) in AGI may be eligible for a reduced credit.