when does Android 4.5 comes and will my phone get update? I got LG OPTIMUS G PRO (F240L)
and I wanna know , will it get OTA 4.5 updates?
Android 4.5 (Android L?) is not yet released.

Google has not yet announced the release date.

If you are a developer, you can take a look at Android L Developer Preview.

Once the official Android L is released, your OEM (LG) may think of porting it to your phone model (LG Optimus G Pro), and after the porting is completed and tested, LG may provide the OTA update.