From Slayer.net:
AN OPEN LETTER TO SLAYER FANS AROUND THE WORLD:
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While Jeff’s been doing some writing and has been coming to rehearsal over the past several weeks, he has decided he needs to take more time to continue his rehab. While we want him back onstage with the band, all of us support his decision. So, we’re very grateful that Gary Holt will continue to fill in for Jeff, and will tour with us until Jeff completes his rehab and is ready to return. How long will that be? The best and most honest answer we can give you is ‘as long as it takes.’ We also wanted you to know that we’ve been doing some writing and recording for the next Slayer album – we’ve tracked a few songs, and will finish the album when we’re off the road later this year.
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Well wishes to Jeff Hanneman.