Full Tilt, 5$/90, AK - Villain insta-shoves the flop

[Tackleberry]

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t80/t160
9 players
Converter

Stack sizes:
UTG: t10345
UTG+1: t4600
MP1: t8140
MP2: t6395
Hero: t6040
CO: t1220
Button: t7480
SB: t5565
BB: t4840

Pre-flop: (9 players) Hero is MP3 with A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img]
<font color="#cc0000">UTG raises to t320</font>, UTG+1 calls t320 <font color="aaaaaa">(pot was t560)</font>, 2 folds, <font color="#cc0000">Hero raises to t1520</font>, 5 folds, UTG+1 calls t1200 <font color="aaaaaa">(pot was t2400)</font>.

Flop: 5[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/heart.gif[/img] (t3600, 2 players)
<font color="#cc0000">UTG+1 is all-in t3080</font>, Hero ???

What the heck is Villain doing here? Is this often enough a bluff to call it? Or does he have the 5? Or 99/TT/JJ? What should I do? Any comments are greatly appreciated ...