Steam Autumn Sale Today?

As mentioned below, in announcing the new Prison Architect DLC, Paradox Interactive also squeals about the Steam Autumn Sale, saying this annual event gets underway today, exactly one year after last year's sale. This is not officially confirmed, and does not jibe with a recent post from the SteamDB saying this sale will launch on November 26th. That said, here's the part of their press release that spills the beans:
Prison Architect will be included in Steam’s annual Autumn sale where it will be available for purchase at a 75 percent discount from Thursday, November 21, through Tuesday, December 3.