The primary changes:
"Haves" are specifically called out as okay.
The warning is now explicit about what "misuse" means (spoiler: it means the same thing we've been saying—anything that's not outlined as okay is not okay).
Only off-site links are forbidden. This is intentional, and it's possible that explicit ways of actually linking to e.g. a group may be introduced in the future.
Things such as "the offer from X I just got" or "egg XXXX that repulsed" are now forbidden by way of messages needing to be applicable to more than just a single targeted person.