Hover Bovver:
The aft bulkhead is not pushed back to increase the cabin space. There is a cabin plug/extension in the mid section of the fuselage. The baggage bay of the S should be at the very least the same as the E if not bigger.
Chopper Dr:
Dont know where you got this info but as far as I am aware there are no plans for a Fenestron or indeed skids. As to why skids would be a positive upgrade for all markets is anyones guess, if anything this would reduce capability.
PA News:
The 'Paddle' tail rotor blade design is a composite blade which is significantly shorter tip to root and has quite a wide chord. Apparently substantially reduces T/R noise levels.