Add note on incoming ts-mode

Author: theothornhill

README.md

@@ -47,6 +47,13 @@ does at least have an option for working with Typescript, even though it may not
 But once new Emacs ships with tree-sitter support, you are adviced to upgrade to the newer modes for better TypeScript-support, rather
 than keeping this old version around.
 
+## Good news!
+Emacs 29 will ship with tree-sitter support, and it will actually have in-tree
+support for TypeScript!  So now you can just use the provided `ts-mode` and get
+the fresh tree-sitter powered functionalities for free.  Yes, that means both
+tsx and regular types will actually work.  Development will continue in emacs
+core, rather than this repo.  We hope you'll like the new experience.
+
 # Installation
 
 `typescript.el` can be installed from source directly using your