Pixel 7a was released and Google shared the first Pixel 7a Android 13-based factory images also. This phone has two variants and the first version comes on the device at the release of the March patch. At the time of review, the newer QPR2-based(May 2023 patch) is also available.
When you set your Pixel 7a then you can install the latest system update. When something goes wrong with the device system then the factory images can be useful.
Those users who want to use the latest system update on the newest Pixel 7a then they won’t to able to do that because Android 14 Beta and Android 13 QPR3 beta are not available for Pixel 7a.
Lastly, in next month the company will release the Android 13 QPR3 June patch and it may be possible they will provide Android 14 Beta for Pixel 7a in the coming weeks.