4 8 15 16 23 42      (joke)
EDIT: I actually love this stuff. But I have not been en-lighted so far, therefore I join the discussion.
We know:
1.) 162 is the message. It's of course unsure if this is actually a number  

  It could be 1 - 6 - 2 or 16 - 2 or A - F - B or  ~ (that's the Ascii Code)...    you get the idea  

    And of course it still could be the number of days until release 
2.) it's somehow related to 
It's something everybody on HLP knows, even if they don't usually think of it. The obvious moderator's answer would be the 
search-function 
 but somehow I doubt it. Donations-Page would also be funny. The Ascii theory would give us the ~ but that's stupid.
By the way, if you search for A F D you get the Common Issues thread  

  Yeah, okay I stop it.
3.) it's related to Silent Thread Reborn. 
Proof: The Halo 2 Riddle was related to the actual game as well.
However Goob, a hint about what we are actually looking for would be nice? Is it something actually related to the release? Or just a completely generic riddle? Because it could be anything from 
ST:R takes place 162 days after FS1 ended to 
162 is the result of all team members' age added together   
Boys and Girls, we need more ideas here. Discuss!