Rather than bumping the other thread from five pages back, here's a new thread where we can argue over the mechanism SRAM uses for DoubleTap and the pros and cons of Campy thumbshifters!

The big announcement seems to be that it'll have the option of an 11-32 (11-12-13-15-16-17-22-25-28-32) cassette, offering nearly the same ratios as a triple.

• Shift/Brake levers: SRAM Apex Double Tap, double compatible only (344g per pair)
• Rear derailleur: SRAM Apex mid- or short-cage (SC - 200g, MC - 210g)
• Front derailleur: SRAM Apex Zero Loss, braze-on, 31.8mm clamp-on or 34.9mm clamp-on (BO- 89g, CO - 103g)
• Cassette: PG-1050, 11-32, 11-28, 11-26, 11-23 (11-32 - 299g)
• Brake calipers: SRAM Apex Skelotonized Dual Pivot (306g per pair)
• Crank set: SRAM Apex GXP 50/34 or 53/39 (890g - including GXP bottom bracket)
• Bottom bracket: SRAM Apex GXP
• Chain: SRAM Apex PG-1050

Source