Google has released the first preview of Android 14 and an accompanying release schedule. As the image below shows, Google is only issuing Developer Previews for now, with Beta Releases likely landing in mid-March or early April. Google also hopes that Android 14 will reach Platform Stability in June before a stable release in August or September.
In other words, Android 14 will follow the same release schedule as Android 12 and Android 13. Currently, Google restricts Android 14 Developer Preview 1 (DP1) to Pixel devices, with the Pixel 4a 5G through Pixel 7 Pro eligible for an early look at Android 13's successor. It is worth noting that Developer Previews give developers a chance to adapt apps to new APIS and behaviour changes. As such, Android 14 DP1 adds hardly any new user-facing features.
Instead, Google is likely to use this year's Google I/O conference to showcase how Android 14 differs from Android 13. Typically, the company hosts I/O in May, although it has not confirmed I/O 2023 dates yet. For the time being, Google has outlined that Android 14 will focus on optimising the OS for large displays, which started with Android 12L and continued with Android 13. This year's OS update should also contain more accessibility features, as well as reduced response times and associated battery life improvements. You can find more details about Android 14 DP1 and how to install it on Google's dedicated developer portal.
Source(s)
Google via XDA Developers