Sukhoi issued a statement at the Farnborough show to the effect that the brakes and flight controls will be modified to reduce the max weight LDR from its current c1,600m Dry Runway requirement. It certainly looks as if the aircraft in its present form would be considerably payload-limited at SEN in WET WET WET conditions and could not operate at all at LCY as things stand - hence the reason why Cityjet will not introduce it at LCY until late 2018 apparently.