Let's get the obvious out of the way:
October will be the eleventh consecutive month of YOY declines. There's no escaping it, and we're likely to see the trend last for at least another month or two before lower 2012 results make for easy targets to hit.
Declines will be paced by poor performance in hardware sales, as generational fatigue and saturation have set in. Even with a price drop in October, the Xbox 360 won't make it's number of 393,000 units from 2011. I optimistically expect sales to be at around 300,000 units, though that number could be lower. 3DS sales should be relatively flat, despite launches of Pokemon Black & White 2. PlayStation 3 sales should post declines, perhaps moderately so, and Wii sales won't recover much despite recent price changes. Vita will be a non-factor once again.
Software is tough to predict, mainly because we're only privy to physical sales. My best guess is that NBA 2K13, Pokemon Black 2, and Pokemon White 2 comprise the top three games for the month. Expect Skylanders Giants and Just Dance 4 to also make the list, along with holdovers from September including Borderlands 2 and FIFA 13. Dishonored probably charts, but XCOM and Medal of Honor: Warfighter might not.
Overall, software should be down as opposed to last year. I'm not confident that NBA 2K13 and Pokemon can combine to sell 3.5 million units, as we saw Battlefield 3 and Batman: Arkham City move last year. As with prior months, software declines won't be as pronounced as we'll see on the hardware side.
I'm projecting October total revenue to come in somewhere between $840-$860 million. That's in the range of a 20-22% loss. That could be optimistic, but a decent slate of October releases and price cuts for Wii & Xbox 360 may mitigate some damage.
We'll see how everything shakes out next week.