In October, the DC will receive the 1605 update, the same one issued to CC customers this week.
The rolling release tempo for Office 365's Deferred Channel allows corporate customers to pass on one update. In this opening scenario, where DC users have been on 1509 since February, they will be allowed to skip 1602, but not both 1602 and 1605. In October, they may upgrade to either 1602 or 1605. The former falls off the support list in February 2017, while the latter will be "serviced" -- to use Mansukhani's term -- until June 2017.
Yes, it can be confusing.
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