Interesting. Last year after they released christmas Q shipments they didn't revise their 15m forecast which was ending in 2 months from then, which means they expected 2.8 for Q1. They missed it by 700k, either they didn't want to revise, or the earthquake affected their shipments and that's the reason they only shipped 2.1.
They expect 'slighly ahead' of 9.5M over next 6 months then. If Q1 was expected to be 2.8 last year but faltered due to the earthquake or whatever reaosns, then it's likely they expect 2.8~ again next Q1, leaving 6.7~ with the slightly ahead figures matched on to both? Perhaps 7.1 and 2.6
Ranges can be anywhere from:
Q4 - 6.7 - 7.5
Q1 - 2.1 - 3
Wish MS were more open with their numbers like Sony and Ninty, makes it easier to know how sales are panning out