Most of this is listed right on the Vive website if you took a look at it. https://www.vive.com/us/product/vive-pro2/overview/
Additionally, the 3264 x 1632 resolution support coming soon will be in the form of a software update, not a hardware update.
I have also confirmed with the HTC Vive Support Team that the Vive Pro Wireless Adapter Attachment Kit is compatible with the Vive Pro 2.
Hopefully that answers all of your questions.