Will share my experience hoping it may help someone out there in the future.
I signed up for the Xcare 10 year plan with 49k miles on the odometer (factory warranty expires at 50k, battery and drivetrain in 2028 or 150k miles). A month later, Xcare updates their plans with battery and drivetrain for ~$900 more for the 10 year plan. I thought this would be a no brainer to upgrade.
However, at this time my car odometer reads ~50,100 miles so the 10 year prices jump by a large amount. It didn't make sense for me at the time to pay extra since my battery and drivetrain are still covered to 2028. It's likely that once my battery and drivetrain warranty expires, I get a prorated refund and buy a new plan.
If your car is under 50,000 miles and you purchased a plan recently, your best bet is to reach out to them and get a prorated refund on your existing warranty and upgrade to the new warranty which now covers battery and drivetrain. Overall, I'm still happy with the customer service. It's just unfortunate the timing between initially purchasing and them releasing the new plans had me surpass the 50k mile mark. Prices take a big jump at 50k, so play with the toggles on their website and plan accordingly.
Still 100% happy with my 10 year warranty from Xcare.