The 20th is just a shy 6 days away and people are already getting more and more excited about Sony's announcements happening that day. No solid details have been revealed if Sony will be announcing a new next-gen consol, though these tweets, which were back tracked and later fixed may have confirmed that the PS4 is indeed getting announced.
“20th of this month. PS4 announcement venues have been e-mail[ed].” Honda-san tweeted to the President of Sony.
While this is most likely a mistake, a tweet from the President of Sony seems to differ from that. “It will be at 8:00 am Japan time 21. Thanks in advance.”