Android 15’s preview version for developers has been scheduled to be released on February 15, 2024, according to a Google engineer’s comment on an AOSP commit page. The stable and official version is expected to be released in the latter part of the year.
Developers can expect the release of Android 15 this week.

The 9to5google site concealed the identity of the Google employee who disclosed the release date of Android 15 for developers in the image to prevent any potential issues.
Perhaps it would be wise to hold off until Android V is released? The initial developer preview is set for February 15.

Android 15 is expected to be released about one week after the launch of Android 14 QPR3 Beta 1, which was first previewed on February 8, 2023.
What should you anticipate in the Android 15 Developer Preview?
The initial Android 15 preview for developers is anticipated to offer a first substantial glimpse of the annual operating system release from Google. A key feature to look forward to is the “private space” function, enabling users to conceal and restrict access to specific applications in their app list.
Launch and release dates
Android 15 is rumored to launch on February 15, 2024, with a probable initial release for Pixel 6.