Heli-Air's got one in - Q says he's flown it and it's got 'bags more power.'
It says here: 'The R44 Raven II features the new Lycoming IO-540 Fuel Injected, Angled-Valve, Tuned Induction engine, designed by Lycoming in co-operation with Robinson exclusively for the Raven II. The new engine is derated to 245hp for five minutes, and 205 hp max continuous rating. This allows a 100 lb increase in the R44's gross weight and increased IGE and OGE hover ceilings, while eliminating the carburetor and the need for carburetor heat.
'Both sets of rotors are fitted with noise attenuating blade caps that decrease flyover noise by 1db. The main rotor blades also have more surface area for increased lifting capability at altitude.'
I don't want to be a wet blanket but I suspect it's still going to be subject to induction icing in UK weather. You've still got atomisation of fuel, you've still got a butterfly. Only thing you haven't got now is carb heat.