Re: 12th Gen
Intel has not launched mobile 13th Gen CPU's which these tablets are using. The mobile parts are coming perhaps later this year - or not.
Micros~1 - like any other PC manufacturers - need working CPU samples for testing early in the design phase. Because the devices are coming out in couple of weeks, they should be mostly built and waiting in warehouses/transit. This means that Intel would have had mobile 13th Gen's built in quantity already. Intel would also have generally launched them already to counter AMD and ARM.