Yes, Android 15 is available on all our Genymotion Cloud products (Genymotion SaaS, Genymotion Device Image) and with Genymotion Desktop since ver. 3.9.0.
For a comprehensive list of all supported Android versions, please refer to Which Android versions are available?
Genymotion Desktop - Windows
Android 15 does not work well with Genymotion Desktop on Windows systems yet.
Genymotion Desktop - VirtualBox
Android 15 does not work well with Genmotion Desktop using VirtualBox hypervisor. Make sure to use QEMU hypervisor instead. See How to switch hypervisor?