Inter Parte review won't be valid for a little while, per "(1) 9 months after the grant of the patent or issuance of a reissue patent; or (2) if a post grant review is instituted, the termination of the post grant review." However, you are correct, I am sorry I missed that. I will update.

Don't worry about it. I'm excited to finally find a forum on stack where I actually know the answer to some questions.

I can only say for the US as the EPO or JPO may be different for example. And variations may be patentable depending upon the variation. If you want to get into the super nitty gritty, I am not qualified for that. You may want to talk to an attorney that does design patents for better answers that aren't in the Wikipedia page. The USPTO site may also have more in depth answers