I don't understand the argument some have that a PHB2 or revised PHB type book would be too soon. 2E had its second version of the PHB 6 years after release. PHB 3rd had its revised PHB 3 years after release, then PHB2 3 years after that. 4th edition PHB2 came in the second year of the game, and PHB3 the year after that. It could be argued that the fundamental systems of 5E allows for longer periods before a second or revised PHB needs to be released, but I'd argue that 6 years is plenty of time for it to make sense.
Of course, if these new rules aren't intended to be fully incorporated into the base classes, then I could see this being more like a Xanathar's type book full of more granular options than what came before.
To me, it still feels like they're looking at some of the fundamental issues many tables have with each class and seeing if these solutions might work for those tables. To me, that points more towards a revised PHB than a XGTE type book.
I think the one other argument is that there's been less releases each year compared to previous editions, and that it makes the 6 years feel less than it is. That's an argument I don't really have a defense against.
Of course, if these new rules aren't intended to be fully incorporated into the base classes, then I could see this being more like a Xanathar's type book full of more granular options than what came before.
To me, it still feels like they're looking at some of the fundamental issues many tables have with each class and seeing if these solutions might work for those tables. To me, that points more towards a revised PHB than a XGTE type book.
I think the one other argument is that there's been less releases each year compared to previous editions, and that it makes the 6 years feel less than it is. That's an argument I don't really have a defense against.