Pokerstars announce VIP club changes without the why?

PokerStars has sent an email to their customers advising them of the intention to change the current VIP Club Program sometime in 2017 without an explanation as to why?

PokerStars has sent an email to their members updating them on proposed changes to their VIP Club program beginning in 2017.

It’s a short and sparse email that omits a critical word.

Why?