Quote: "Is the scene editor included or it is work in progress?"
It is not included yet it is still in pre-alpha development
Quote: "No one really mention it and I"ve seen no video about it. So Is it going to be a new editor or it is based on either the Visual Editor or Placement Editor?"
It isn't ready to be shown yet, there will be updates
Quote: "In case it is a new editor but work in progress, can we at least get some idea what the experience is going to be like, can we get some info on that?"
Same as above not ready yet
Quote: "Is the scene in the trailer being rendered in AGKS or it is only a 3D animation not related to AGKS engine in any ways?"
The scene in the trailer is rendered in AGKS with a few custom shaders, remember this is an early version.
Quote: "Is HTML5 export coming? It is kind of important to me, not that I'm not going to buy it for Android and Windows development but for example, HTML5 could be a way to export to UWP with Visual Studio if AGKS is not going to support it natively."
No definate word on this yet, I believe the plan is to support the same export methods as AppGameKit Classic
Quote: "If I buy a Steam key now, am I going to get it or I need to download from TGC for now?"
If you buy a Steam key now, you will get a TGC download version until June. Then in June you lose the TGC version and get a Steam Key instead
Quote: "If I get a Steam key now, why AGKS is not available on Steam as Early Access? I would love that"
The early tests will not be on Steam at all, this is a TGC only product for now.
Quote: "Been told the AGKClassic DLC's are compatible. So can I just copy and paste the DLC folder in to AGKS? "
This hasn't been added to Studio yet and DLC support wouldn't be tested anyway as it is an alpha. The plan is the AppGameKit Classic DLCs will be detected by Studio and work easily.
Quote: "Will the DLC's be available for AGKS officially so we don't need to install AGKC only to download the DLC's?"
No word on this yet it depends on Steam's support for this.
Windows 10, Intel i7 4.2 GHz, 16GB DDR4, NVIDIA RTX 2060