There is no confirmed news so stop treating it as confirmed news that 'Deep Forest is coming too'.
Quote from Kaz, 18 months ago, “We are already working on Deep Forest; we actually have the data for Deep Forest that runs on Gran Turismo Sport but it does have some problems.”
That doesn't mean it is definitely coming, especially not related specifically to an update in the next few weeks. I'm sure there's loads of stuff they started to develop, or have origins for, that hasn't come yet, or may never come. It isn't official confirmation.
And there is no confirmation about Silverstone. It is just rumoured because people were trying to think of a real life FIA Track with multiple layouts, suitable for a mix of cars, that's it. It may come, it may not.
Treating rumours as 99% confirmed is exactly why the stupid Spa stuff happened. People said it was coming just because someone said so, and guess what? GTSport still doesn't have that track.