Don't think so- the circumstances in which you can be downgraded haven't been changed- it's just been clarified that if it happens, that is use of your ALT.
There never was any compensation for downgrade, nor any replacement ALT- this has simply spelled it out.
What DOES suck there (and it's not a change, though I didn't previously know about it) is that it says that if you are entitles to J/F but are on a two class aircraft, you get booked Y and only upgraded if space is available.
I don't understand the logic there...