I can say for sure it will happen before September now.

The actual situation is something like ~21m vs ~11m right now.

My prediction:

End of August: ~28m / ~14m

It can happen even before if PS4 start to sell over 1 million per month.

I think that both you XBO and PS4 prediction are too much. But yeah, this prediction (PS4 X2 XBO in Sep) is more strong than by January now!

Updated the OP with graphs. We don't have exact data for april 11th through may 9th, so I estimated as best as possible.

Did Sony announce 22.7m million sold?

All I see is Sony announcing 22.3m as of april 30th.
Not sure I trust those low PS4 sales.

I don't think it's going to happen.

Going off of VGC numbers (not official, I know) and assuming the Xbox continues to sell at the same pace it has for 2015 up until now (just over 87K units a week) that would put the Xbox One at 13.821 million by the end of September.

That would mean the PS4 would need to be at 27.642 million by the end of September. This just won't happen. Even if the PS4 sells at the same rate it did for the beginning of this year it would land at 25.63 million by the end of September. That might even be too high because it doesn't have any big console pushing games (like Bloodborne) from now till the end of September.

Though realistically I'm not sure the summer will bring the kind of sales that we've seen up until this point in the year.

My prediction,

Xbox One: 13.25m
PS4: 24.6m

Use April at 22.3M for ps4 and X1 at no more than 12M... That means ps4 needs 1,7M over 2:1 or 80k more than Double. Not impossible.

Doubling ? Not necessary, but sell more between september/december in US ? For sure, there is no doubt about that, Halo cant beat exclusive marketing/bundle on COD + Batman + MGS V + AC + Star Wars ( during star wars 7 ! )+ im sure i forgot one.

TR wont be such big deal since everyone knows it will come on PS4.

And Forza is not such big system seller

Realistically, Sony will need a price drop and that new SKU at e3 in order for this to happen.

Look for my remaster bundle.

Ps4 1Tb with TLOUR, UC:NDC, GoW3 for 350,00 on the Holiday. Master kill.

You are too sure of you prediction... don't forget what happen last year...

I dont forget what happenned last year : Sony had almost nothing big, except Destiny marketing/bundle and Microsoft had Halo MCC, a new color and COD/AC marketing/bundle ( without these 2 , it would have been a different story)

This year Sony get the huge COD and all the multiplatform games, it's not even a bet, it's too easy to predict that it will win, as big as Halo is, it cant compete against all these deals, especially during Star Wars 7 release