While Salesforce has releases scheduled 3 times an year, Marketing Cloud, formerly Exact Target, follows it own schedule and releases more frequently. Here’s the glimpse of the MC Release Schedule for 2019
Be in the know of the latest features and updates by signing up for release communications. To subscribe, browse to http://pages.mktg.salesforce.com/preferencecenter and input your email id. Once you receive the email, click the Preference Center link and Select ‘ Marketing Communications regarding Salesforce Products, Services, and Events’ under the Subscription Tab and save your changes.
Source: https://help.salesforce.com/articleView?id=mc_rn_2019_release_schedule.htm&type=5
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