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Both will be next year, both their actual releases and any teasers/promo stuff for them. Warwick's the next large scale update that will come out and will be out before the next new champion.
We'd originally been planning on buffing Nid in patch 7.1. We came to the conclusion a couple of days ago though that it wasn't appropriate to wait that long after watching her performance in 6.23. Since we were right at the end of the patch development cycle we didn't have time to do anything but a very simple buff. A base AD increase seemed like a good approach as a result, given it's fairly predictable and adds power to Nid regardless of build or position (something we do want to do).
I think it's pretty likely we also look at Nid in 7.1 anyway. We do think it's likely her performance will improve a bit as players optimize her more for the new jungle (she's got more jungling nuances than most). She might still be too weak even with this base stat buff though.
No immediate plans for it. It's an opportunity to do better, but not a priority relative to other higher value work.
Yep. Those changes should be in the next patch.