The iPad Pro will probably be MUCH lighter and a bit thinner than the Note 12.2
The Note Pro is pretty lightweight, aided mostly by plastic construction. About the only way the Pro could be lighter is if they finally change from aluminium to a different material. Either Magnesium Alloy or Carbon Fibre.
Would be great if they added a kickstand. Though that would both make it thicker, and perhaps be too... Microsoft-y for Apple