Available in pairs, even if very little have to do with each other: we talk about the third beta Android P, as well as the fourth developer preview, and the security patches of July for Pixel and Nexus.
If you were not already subscribed to the Android P beta program, you can remedy by clicking on this link to verify that you have suitable devices. But if you prefer the direct download of the firmware from flashare, you can find it on the official site, flanked by OTA files, always to be installed manually.
Google does not report any news on the user side, but instead invites developers to update their devices, to test their apps and make them compatible with Android P, since this developer preview includes an almost final version of the Android P API (API 28). There will also be an AMA on Reddit to answer technical questions regarding Android P on July 19 from 20:30 to 22 hours Italian time. The announcement will be made on r / androiddev in the coming weeks.
The security patches of July instead have solved in particular a critical bug in the Media framework (always among the worst affected) that could allow a remote attacker to use a tailor-made file to execute arbitrary code as a privileged process. However, there are no reports of active exploits or special abuses. (This is the same problem reported last month, which perhaps means that the page has not yet been fully updated.) The rollout of security patches has just begun and will continue over the next few days.