Ok i made an avatar bet on Twitter, XBO to outsell PS4 by at least 2:1 this month.
Dear Xbox one... you better do VERY good.
I know you don't have the August prediction thread up yet (I'm assuming that's not until after July's NPD results), but I wanted to go ahead and put down my provisional estimate:
I'll adjust it after we get July NPD results, but I'm assuming the PS4 will do ~190k in July (80% of June, since June is 5 weeks and July is 4) and stays about flat for August. As for the XBO, I'm assuming the S model gives a somewhat bigger boost than what the 360 S did for the 360. The 360 S was a June release, a 5-week month, so accounting for that we saw an 85.7% increase in the per-week average over May 2010.
However, the 360 S was released on June 18, whereas the 2TB XBO S releases tomorrow, with the smaller HDD models coming on the 23rd. I'm assuming the earlier launch in the month could drive August's weekly average to double what July is. I'm also further assuming that the XBO will, like the PS4, do about 80% of its June numbers for July, or about 170k. Double that and you get 340k. Now, the XBO could conceivably do double what the PS4 does this month, but it's going to be close, perhaps depending on how well both of them did in July.