Form 8889 is required if you had contributions to or withdrawals from an HSA. It is scheduled to be released in an update on 1/26. If you don't include the form, the IRS will assume that your withdrawals or contributions were not allowed, and will send you a bill for additional taxes and penalties. At that point you will have to pay the bill or send them an amended return to fix the problem.
If you asked for a reminder, turbotax should email you when the form is ready.
