"So the 8815-E is not ready"

It's Form 8915-F. New. The IRS just released it, and it isn't through to your program update.

For Disaster years 2020 and later, for Tax years 2021 and later, F = Forever form.

Form 8915-E is only used for Disaster year 2020 and Tax year 2020.

"Why is this not in the first release, let alone the mid February releases?"

You can watch the Forms release dates, as we all would.