Ask HN: New tax plan and AMT?

The proposed tax plan should repeal the AMT tax, which is fundamentally a good thing for startup employees.

My question is: if you already paid AMT tax in the past and are still taking advantage of AMT credits every year (because you paid AMT tax due to stock options exercise), will those credits go away from now on? Or will those people be grandfathered in and will keep calculating their AMT taxable every year so that they can claim the credit if the spread between federal and AMT in future years is positive?

I tried to read the bill but it's really too complicated for me to understand.

Thanks