Has anyone else noticed that the symbol in the hatch, was also on the tail of the shark!!! What could this possibbly do with anything? Was the government engineering a new breed of shark? Desmond was asking locke, are you him..Who is HIM? Very confused and cant wait to see what happens next...

No. Nobody noticed that yet.

Especially not the people posting in the thread entitled "THE SHARK HAD THE SYMBOL ON IT"

pure speculation, if mr. hatchdweller is so obsessed with the numbers, wouldn't you think he'd want to see hurley?