Are just rumors, folks. No need to start wetting our pants.
Seriously. We go through this every time a new edition or army book comes out, and that's also true of 40k. About half of what we hear is even close to being true, and the other half is true but looks different in its proper context. Want to have some fun? Google rumors from when 8th Edition was about to drop, or any of the 40k editions. See how accurate they were.
Remember, End Times is supposed to be 100% compatible with 9th Edition, so they can't change it too much since it's also fully compatible with 8th. Are Lizardmen getting removed? Doubtful. I'm sure that even in a worst case scenario Lizardmen will still be playable using their current book.
And as a Bretonnian player, I'll offer ZERO sympathy to anyone who complains about how their book hasn't been updated recently. My Bretonnia book was printed in 2003, Jack. Don't come here looking for pity.
So everyone relax, settle down, just wait and see.