I keep finding stuff that IMO is better than official docs, like this: I7Handbook - The Inform 7 Handbook - I7 Handbook (and of course Ron Newcomb’s thing I’ve posted about few years back), but they’re all outdated (this is for 6.x) and seemingly no one is updating them.
There is a draft, yes. I haven’t heard anything about an official release.
It’s listed in this megapost of Inform 7 resources:
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Even though a lot of stuff is outdated, they are all still incredibly valuable resources. Most of the Inform 7 stuff has remained the same. If there are a couple minor changes that make something broken in the newer versions, the people on this forum can help.