Unannounced price increase Power Apps Premium?

In the September pricelist, there's a pricing change on the Power Apps Premium licenses, as you can see in screenshot a price increase of +10%. 

But there has been 0 communication or announcement on this. 

Documentation on the pricing website, Learn and License Guide still shows the old pricing: Power Apps Licensing and Pricing | Low-Code AI App Builder / 

https://go.microsoft.com/fwlink/?linkid=2085130 / 

Is the price increase correct? If so, then why was there no communication with regards to it? 

And if not correct, when is this going to be adjusted and fixed for Power Apps Premium licenses ordered past 1st of September? 

Cheers,

Martijn