6 months, all that needs to get in is a proposal (first alpha is a month away so there's plenty of time to flesh it out). We can still package rustc without needing a change, but cargo would be delayed if there isn't a proposal on the wiki before the end of day.
Yeah, there was a bugzilla for the packaging, 'changes' are done on the wiki and are for things more than 'just' packaging up software (where guidelines are needed, in this case).
Someone got a draft up last night [0], and discussion is happening on -devel. If things go well this may make it in F25.
Will Fedora ever rename/relogo Copr? Surely it was a joke to use the Greek word for faeces (κόπρο) and a logo of a side-on view of a sphincter pushing out a fresh coil.