3:15? 3 + 1 + 5 = 9. September is the 9th month. The ad in that pic also says September 9. That's two matches for 9. On 9/9, something is going down, but that's too obvious.
156 songs? Add 100 to that, and it's 256, which is double 128. He's obviously hinting at something Mario 128 related there. Where did I get the 100 from? Simple, 100 seconds = 1:40 minutes, which comes from the 104 PM's mixed around to make 140, because obviously he wouldn't directly make it 140, that would be too easy.
10.7 hours of songs, what could that mean? 10th July? What happened then? Hmmm there's 59 days between then and September 9. 59, what significance could that have? 5 + 9 = 14. 14 - 9 = 5.
Now we have 5! 5 announcements on September 9? Maybe they will show 5 minutes worth of trailers? Will the Mario 128 trailer go for 5 minutes?
Hmmm, the fifth day of the week! OF COURSE! It's a friday, TOMORROW is Friday over there in America land! HOLY CRAP, FRIDAYTON!
EDIT: OMG!!! I really had to add another 5 to that! Friday the 19th + 5 = Wednesday the 24th!!! WEDNESDAYTON!!!!