Form 8515-E is available and e-filable now. If you are using the desktop version, make sure your program is updated.
I have seen a complaint that the required forms can't be e-filed yet for New York State, and possibly other states are affected. If you are not able to e-file your state return, pay attention to the alert message in the program, it may give you a date or a change to sign up for e-mail notification when it is ready. If you know a specific form number that can't be e-filed, you can look it up here.
https://ttlc.intuit.com/community/forms/help/state-forms-availability-table-for-turbotax-individual-...
