When viewing the audio file in Microsoft Word, these lines of code are revealed.
00000000 00000210 00000825 000000000037474B 00000000 0016FDA0 00000000 00000000 00000000 00000000 00000000 00000000TCON
A person on the audio file reads out the letters below:
MOD ZZZ JNQRYD3FRP
The separate word document also only has these six words posted.
Cryptography
Isotope
Philanthropy
Hydrogen
Ember
Rebirth
The postage stamp says it came from Maryland. Could this be from Bethesda as a tease for Fallout: New Vegas?
Update: Ok, wow, monster updates here. Joystiq was able to put together a lot of the clues.
The code MOD ZZZ JNQRYD3FRP is deciphered into the website http://www.gknova6.com/.
The recorded message found on the website can be deciphered using the Baconian Cipher into APRIL WEEK TWO. You can also mess around with the TV dial to see nuclear imagery,
So it looks like something is coming next week.
Think this has anything to do with vegas? That nova website is interesting, has lots of "nuclear" imagery, so that could mean new vegas or something completely else.