There is no need to worry.
The beta-production samples has beta firmware.
This doesn't mean that the firmware 1.0 does not exist. It just means that Pentax has not made the 1.0 official yet. It is currently not available outside the R&D at the Japan HQ. But yes, firmware 1.0 do exist.
Camera will begin to ship from the factories late June.
Then it will take some time for the camera to enter the shops, because it takes some time to travel with the boat from the Phillipines where the camera is made, but the schedule is still early July.
Oh, and note that the beta samples of the K20D never got firmware 1.00 (I don't remember now if the latest firmware was 0.23, 0.3 or 0.6 for beta K20D) - and then suddenly, like out of the blue, we had production cameras with firmware 1.0. Don't understand how it happened really, but it did.