Justin Timberlake is now poised to get a slap on the wrist in his alleged drunk driving case. RadarOnline.com can reveal the singer landed a deal with prosecutors to get a more lenient punishment by pleading guilty to a less serious offense. Timberlake, 43, was arrested in June and charged with driving while intoxicated (DWI) in Sag Harbor, New York. But thanks to negotiations by his powerhouse attorney Ed Burke, the singer now reportedly plans to plead guilty to “driving while ability impaired”. The new charge is technically not classified as a drunk driving offense and will carry a punishmen…