My previous summer prediction seems unlikely now that I think about it, here's my revised monthly sales predictions:

This assumes that ntkrnl's leak was accurate (he said Xbox One would release in more countries in April and October, also that Halo 5 would be replaced by Halo 2 Anniversary with included Halo 5 beta access for December). It also assumes an April release for Mario Kart and November releases for Super Smash Bros and Halo 2 Anniversary, as well as late October-early November price drops for both the Wii U and Xbox One (down to $250 and $400 respectively).  

This puts the Xbox One passing the Wii U in November.

My previous summer prediction seems unlikely now that I think about it, here's my revised monthly sales predictions:

I'm counting the week of Dec 29th-Jan 4th as part of January instead of December. That puts the Xbox One at 439k and the Wii U at 268k so far this month with one week to go.

I'm honestly not sure if it is or not, I got my numbers for 2013 from this thread: http://gamrconnect.vgchartz.com/thread.php?id=151051

He has the it listed as 3.05m X1 and 5.38 Wii U without the week of Dec 29th-Jan 4th included, I assume he either counted the week twice or VGchartz has adjusted some of the previous week's numbers since he put the numbers in his chart. Ultimately that single week doesn't matter too much in the grand scheme of my prediction though. The Xbox One would still overtake the Wii U in November.