I think we all know that this is only a matter of time now so why don't we try to predict the week it is going to happen?
Some information to help making the prediction.
As of July 5th Vgchartz shows the PS4 3.9 million games behind the Wii U.
upcoming bigger games for the 2:
TLOU:R July 29th
Hyrule Warriors (JP) August 14th
Minecraft PS4 August
Madden August 26th
Destiny September 9th
Hyrule Warriors (EU/NA) September 19th/26th
Fifa 15 September 23rd/26th
There's more but those are the big ones until September (I'm 100% certain that the PS4 will be ahead by September at the latest)