The public prerelease versions of Apple's system software increment as we get close to WWDC. Jeff Carlson writes about mobile technology for CNET. He is also the author of dozens of how-to books covering a wide spectrum ranging from Apple devices and cameras to photo editing software and PalmPilots. He drinks a lot of coffee in Seattle. Expertise mobile technology, apple devices, generative ai, photography Apple's Worldwide Developer Conference  is less than two weeks away, where we expect to get our first look at iOS 27 and the other system updates that will likely roll out in the fall. If you want a peek into a more immediate future, Apple has just released the public beta of iOS 26.6, the next version of the current iPhone system. Also available are iPadOS 26.6, MacOS 26.6 Tahoe, WatchOS 26.6 and TVOS 26.6. Prerelease versions for developers were sent out a few days ago. New in this release is a feature you may never run into: an alert when you've blocked too many contacts.…