1) At one point we had plans to redo the Lightning and Wind charts, still sort of do, to be stronger, more diverse, etc. Another change to both of them would be to include Chidori and Rasengan on both charts. Chances are both will still appear in the shop as well.
2) I cant imagine summons changing much. They are still the same as before.
3) Chidori is already lightning so that wouldnt do anything. As for Rasengan, placing an element into it makes it a higher level jutsu, so it would be treated as such. It would also be a third chart jutsu to clear that up.