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Would not see why.
Just wait for the JB of iOS6 :)

To be honest, I only played around with my iPad for some time in the evening. But nothing grabbed my attention like 'oooh wooow - can't live without it!'.
 
I would say No.

I have an iPad2 so cannot try Siri but from what I see while the new Maps is a big disappointment , iOS6 is ok but nothing to get excited about.

The resolution on maps is very poor , points of interest are misplaced and the whole thing looks very cheap and unApple like. I had to use Google Earth to find our hotel, Maps placed it in an industrial area some distance away.
 
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