K, so I was playing around with the image in photoshop and came across this. If you take the three circles and overlay them it spells DOTA, so yeah not sure what that's about.
There is a mismatch on date and place? if you look at 0:07 then search for the original uploaded trailer this one says "10 august Donnerstag" the original says "9 august mittwoch" Valve is messing with us, valve uploading this trailer is extremely suspicious.
original