The original tweet from Jeremy is down below.
"Jeremy Crawford
[MENTION=4036]Jeremy[/MENTION]ECrawford
Replying to
@Navy_DM
and
[MENTION=7434]James[/MENTION]Introcaso
He was referring to the alternative class features we're exploring for various classes, including the ranger. These would be optional rules, not a redesign of a class."
I'm curious what other classes might be getting alternate features. I know that some people are unhappy with the Sorcerer's spells know, but I don't think trading metamagic for another feature would solve that (new metamagic however, like one that changes damage type would work well, and metamagics that allow you to use spells in a new way, like metamagic to use an enchant spell on undead ignoring charm immunity on undead, or other stuff).
I not sure what other class would have alternative features?