I just want to get a rough estimate and you would know a lot more than I would. Last I heard it was 5million (shipped) for X1 and around 7million? (Sold) for PS4.
Those are the last official statements we've gotten about either's WW sales
So here I go with my terrible guesstimation work
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For PS4
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Last WW Update was 7M WW on April 16th and sold through April 6th
From Dec. 28th, Sony had sold 4.2M PS4's WW, so between Dec. 28th, 2013 and April 6th, 2014, approximately 2.8M PS4's were sold WW
PS4 US YTD through March was 910k
Thus US PS4 sales make up approximately 910/2800 of the world's PS4 sales in that period or roughly 32.5% of WW PS4 sales
For sake of argument that seems a bit low so I'll up it to 35% as the base US/World PS4 sales ratio
Thus with sales of PS4 in the US for May and June of 197k and 269k respectively, I would predict around 1332k units sold WW [197+269 = 466, 466/.35] in that time period
And thus PS4 WW LTD would be around 8.33M as of the end of June
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For XB1
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Using the same approach
MS had WW XB1 sales at 3M as of Dec. 31st, 2013
XB1 US 2013 YTD = 909k + 908k = 1817K
Thus XB1 US/WW sales ratio was for that time period 1817/3000 = 60.5%
Therefore with XB1 US 2014 YTD = 1099k then this would suggest XB1 WW 2014 YTD = 1816.5k
So XB1 WW LTD would be around 4.816M as of the end of June
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Again this method is wholly inaccurate I'm sure, the XB1 moreso