Just read on a Brazilian Game Site:
" Two guys, 19-20 years old stolen a playable demo disc from one of the exhibition ps2's on the Konami/Sony booth. According to witnesses, they "forced" one of the PS2 that was playing the game till it opened the cd drive. Then they run like crazy to escape convention center.
L.A.P.D. was called, and is investigating the case, but nothing is know yet."
Opinion of the website: " It's very possible that this demo will show up on the internet soon."
Damn! I though they had tons of security guards on E3. How can 2 guys do this!?