Yes, they will likely add a 4th tier at $1m. It's likely the same top rate as today, it'll just start at more than 2x what it does today, so even someone making 1.2 million would see a 4.6% tax cut for $500k of income and larger in their first 500k.
NOBODY, EXCEPT THOSE WRITING THIS/SEEING IT IN CONGRESS, HAS ANY IDEA WHAT'S IN IT, RIGHT NOW!