Why are people bullet pointing them killing XNA like it doesn't likely have to them transitioning to next gen?
Because there is no "transition to next gen" for most of the XNA community.
Most of them have been left with no path forward, the 3rd party replacement C# / DX wrappers like SharpDX are incomplete, largely undocumented and the last time I looked development on them had slowed down to a crawl.
The path that was suggested by Microsoft for XNA devs was effectively "go back to what devs did before XNA", which meant the loss of managed coding and frameworks that made 3D and game development easier.
The XNA community was left mostly high and dry, have mostly moved on to MonoGame (cross-platform), Unity (cross-platform) and only a very very small amount have moved on to C# / SharpDX based development, a smaller amount have moved to native development.
The loss of XNA is a big deal for some, and the developer community that was built around it are having to move to other platforms, that means iOS, Android and PC.
There is no "XNA for next gen" and all talk from Microsoft has been that there won't be one either.
And you expect them to announce the next XNA before the console is announced?
What do people want from XNA right now? Do they want MS to pour more and more support into XNA than what is established and available right now? They didn't take away the tools from indie developers like people are making it sound, they're just not iterating on them further. Why should they when they're moving to the next generation and indie devs should probably be looking towards next gen right now anyways instead of trying to make a buck at the end of the gen with the infrastructure that is currently there. It's really not a big deal, at all. We even had indie devs comment and say it's probably for the better so MS can rid themselves of what XBLIG has become and replace it with a new platform like what Sony is doing with the PS4 with less of the strings attached.
And I'm not sure what private audiences being debriefed on next gen has to do with it. Some established names are getting early access to the console, the same way as it is for the PS4. John and Jane Doe will get the tools later, should they exist; same with the PS4 when they choose to make those tools available.
There is no XNA for next gen, this comes from Microsoft itself, they are not being quiet on it, they are not hiding it for a later reveal, it doesn't exist, it's not in development and the teams that were responsible for it have been moved to other, unrelated projects.
XNA isn't just dormant, or waiting for the future, XNA is dead, period.