The issue with Pathfinder is that it was a derivative work of D&D, and although it has been rewritten since it's not clear whether the rewrite still is or not. If it is, then it couldn't be licensed on anything else than OGL and may be affected by OGL 1.1; if it's not, then it's simply unaffected by OGL 1.1 (or at least not in a way that will cause any troubles), since it's not up to WotC to decide how is this work being licensed.
Yes, they are. Use CTRL+F to find out. People here are arguing this can be interpreted to impact even games that are unrelated to D&D mechanics or setting. People are freaking out in a sense that would seem disproportionate if this only affected Paizo.
Also, please read the open letter mentioned in the link.
Of course, feel free to argue with them (either the commenters here or with the authors of the letter) if you want, but please not with me: I'm the one asking questions, not offering explanations.
To guard myself from such situation, I'd have to state that I'm licensing it under OGL 1.0a only, at a cost of potentially making it incompatible with content released on a future version of the license - just like some GPL projects do (most notably Linux, which is GPLv2-only).
> I'm the one asking questions, not offering explanations.
And I'm offering explanations :)
> Of course, but that's not what happens when you use someone else's license at all. And no, whoever used OGL with their project is not at any risk at all - unless they used or made derivative works of existing WotC's content licensed under OGL, in which case they had no other choice than to use OGL anyway.
Other people in this comments section are arguing otherwise! Whose interpretation should I trust? Yours? Theirs? Wizards'?