Last post by Dave -
The Raspberry Pi foundation has released an 8gb model of the Pi 4.
It is 64 bit capable and a version of Raspbian is in beta at the moment. They have also renamed the OS to Raspberry Pi OS. The new version will eventually come in both 32 and 64 bit versions with the 32 bit version retaining compatability all the way back to the Alpha models, while the 64 bit version will take advantage of the 8gb memory on the new model.
It is priced at $75 or £74 and links for it can be found in the Rpi blog Here