Gamo have updated the suppressed Whisper air rifle. The Whisper X is apparently makes less noise and has a cool looking ergonomic stock.
The Whisper X is a break barrel and is comes in a .22 or .177 caliber
Weight: 6.61 lbs
Muzzle Velocity: .177 ft/s 1000
Muzzle Velocity: .22 ft/s 722 .
I am not sure about availability or pricing yet. Gamo USA do not update their website very often.
More info here.