Cyberpunk, The Witcher 2 modders and Mac users. The stream will be available on The Witcher Facebook page and on GOG.com.
CD Projekt RED will announce the official name of its Cyberpunk project, hopefully as something that doesn't sound like a dangling adjective when spoken. Mac users can expect "a bunch of thrilling announcements" and details about The Witcher 2 on OSX. Last we heard, The Witcher 2 was scheduled to hit Mac this fall.
Modding news may involve the REDkit mod tools program, which is accepting beta applications through September 30.
The Special Event also includes news from GOG.com: GOG will officially announce plans to bring its lineup of classic PC games to "a new operating system," which we can only assume is Gentoo. OK, fine – it's probably OSX.