In an interview with nymag.com, Julian Casablancas says that the Strokes are working "day and night" on their fourth album.  They were recording their followup to 2006's First Impressions of Earth but had to stop, allegedly because guitarist Albert Hammond Jr. had to go to rehab.  They have two scheduled festival shows, The Isle Of Wight festival and Scotland's RockNess festival), so I imagine that the record will be released to coincide with their summer tour.