When will support end for MailStream Plus 8.3.5 and 8.3.6

Product Affected:  MailStream Plus™
Product Feature: Installation / Upgrade

The USPS has a proposed rate case that if approved will be for mailings going to the USPS Jan. 27, 2019.  Any mailings going to the USPS before this date can be sent using MailStream Plus™ (MSP) 8.3.5 and 8.3.6.  But for mailings being delivered to the USPS Jan. 27, 2019 or later, only the upcoming MSP 8.3.7 should be used.  MSP 8.3.5 and 8.3.6 should not be used after this date and will no longer be supported.
MSP 8.3.7 will be released in mid-December 2018.
UPDATED:  November 21, 2018