The 2007 "classic" ordering info was put online earlier this week:

2007 Silverado 1500 Classic

I've found some additional top secret info...

They will not be badged "Classic", they will only be referrred to as Classic in brochures, advertising and on the window sticker.

Better get your manual transmission now, looks like they are phasing them out completely.

You won't be able to get a 900 series with a V6 until after April 2007.

The new 900 series 1500 Crewcab will start production this October.

 

I was told the '07's won't be out until January. I was going to order a '06 the way I wanted, RCSB 4x4, but they were only taking orders on '06 CC's, and the '07 "classic" wouldn't be here until August. I ended up settling for a '06 with the options I wanted, just not particularly the color. This all transpired within the last week. Picked up my truck yesterday afternoon, it's a nice truck, should last a few years. Now just have to sell the '02 RCSB 2x4.