Just got answers to a couple of questions about the pen. It is NOT pressure sensitive and all versions of the Scribe have the same digitizer.
Apparently that’s done due to the materials used in the screen including the anti-glare layer.
It does have decently low latency, 9ms, though not quite what Samsung hit with the s22 ultra which does however use some special software to achieve that.
Also it is running a “customized device specific” version of Fire OS 8. Fire OS 8 is based on Android 11 builds.
Last but not least IT WILL NOT allow 3rd party apps, at least at launch, though Amazon is considering it for future updates.