These are the only price changes as listed by MS. Not sure why you got that email. The only thing I can think of is that you were on a promotional rate for GPU and that when expired you are returning to the regular value of GPU. The additional points on top of the base cost should be for new members. I will check around for more info, but this is the only price point documentation MS has.
And… the possible kicker
- Members who are already subscribed to Game Pass for Console and have automatic payment renewal enabled will be able to continue to enjoy their membership.
So if you shut it off that checkbox, then this is why.