chances are it's not coming out. Instead buy yourself a single core AMD cpu, and underclock it to 1.0GHz and undervolt to 0.9v, using RMClock. Done. Same cpu performance and wattage without the wait, not to mention you can clock it back up if you need to in the future. That's what I have done with my Sempron LE-1100 in my HTPC.
If you really like waiting, I'd hold out for the 45nm single core Sempron scheduled for Q3 of this year. It's rated at 45 watt, but I'd have a hard time believing that. Should undervolt/underclock well, as well overclock easily. Initial news says it should spec at 2.7GHz with 1MB cache. AM3 cpu