I reckon things have moved on quite a bit since the days of the first Alouette's which, to my mind, recieved something of a 'compromise' colour scheme because of it's many roles - and the fact that painting them green would probably have been very dangerous because of the Northern conflict (i.e. too easily confused with BA helis).
The Dauphin colour scheme reflected it's main role when it was introduced in 1986, namely SAR.
As it has been publicly stated, the new helis main role will be troop movements, so their colour schemes should reflect this i.e. Green (as Army jeeps, trucks, etc) OR Camo (as Army Mowag APC's).
Ok, so the EC-135's are to be mostly used for pilot training, but I reckon for uniformality they too should be painted in 'Army' green (perhaps with some red stripes on the tail booms to reflect their training role).
I also believe that a green/camo colour scheme would perhaps foster a somewhat closer relationship between Air Corps and Army personnel.
(I also reckon that it is time for the AC to start placing the words "AIR CORPS" (in black writing) on their heli tail booms).