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If Edward Snowden does have a pgp key (I can't find one online), it hasn't been revealed in this message. It looks like the signing and encryption keys are the same:

  gpg: armor: BEGIN PGP MESSAGE
  gpg: armor header: Version: GnuPG/MacGPG2 v2.0.19 (Darwin)
  gpg: armor header: Comment: GPGTools - http://gpgtools.org
  :pubkey enc packet: version 3, algo 1, keyid 5B50940B79DEBE35
          data: [4096 bits]
  gpg: public key is 79DEBE35
  :encrypted data packet:
          length: unknown
          mdc_method: 2
  gpg: encrypted with RSA key, ID 79DEBE35
  gpg: decryption failed: secret key not available

Of course, they could have used --hidden-encrypt-to, but I think it's more likely a publicity stunt.

Oh, and if you do find a key claiming to be for Edward Snowden online, verify that it's actually him, ideally through the web of trust, and that it isn't just a key that was created after the news was leaked. I'd be wary of any keys on keyservers claiming to be him that have been uploaded after he went public with this.

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Old: Public-Key Encrypted Session Key Packet(tag 1)(524 bytes) New version(3) Key ID - 0x5B50940B79DEBE35 Pub alg - RSA Encrypt or Sign(pub 1) RSA m^e mod n(4096 bits) - ... -> m = sym alg(1 byte) + checksum(2 bytes) + PKCS-1 block type 02 New: Symmetrically Encrypted and MDC Packet(tag 18)(4096 bytes) partial start Ver 1 Encrypted data [sym alg is specified in pub-key encrypted session key] (plain text + MDC SHA1(20 bytes)) New: (1024 bytes) partial continue New: (18 bytes) partial end

$ gpg --recv-key '0x5B50940B79DEBE35' gpg: requesting key 79DEBE35 from hkp server subkeys.pgp.net gpg: key 2BE0BC29: public key "Verax (Informed Democracy Front)" imported gpg: Total number processed: 1 gpg: imported: 1 (RSA: 1)

$ gpg --list-sigs 2BE0BC29 pub 4096R/2BE0BC29 2013-05-20 uid Verax (Informed Democracy Front) sig 3 2BE0BC29 2013-05-20 Verax (Informed Democracy Front) sub 4096R/79DEBE35 2013-05-20 sig 2BE0BC29 2013-05-20 Verax (Informed Democracy Front)