Greetings!
Today, on 2017-January-10, we have reached Fedora 26 Change Checkpoint: Proposal submission deadline (Changes requiring mass rebuild) [1].
At this point, only Changes not requiring mass rebuild will be accepted for Fedora 26. Any Change Proposal requiring mass rebuild should be scheduled for a later Fedora release.
System Wide as well as Self Contained Changes not causing a need for mass rebuild are still accepted according to the F26 schedule [1].
[1] https://fedoraproject.org/wiki/Releases/26/Schedule
Regards, Jan
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