Samsung have yet to release the Samsung Galaxy Beam Jelly Bean update, although it would appear that a test firmware of Android 4.1.2 has been leaked for the device.
The test firmware update apparently makes the Samsung Galaxy Beam much faster and also improves battery life of the handset.
You can find out more details about the leaked Samsung Galaxy Beam Jelly Bean update over at Sammobile at the link below, there are no details as yet on when Samsung will release the official update.
Source Sammobile