thank you for posting. It looks that the pieces for a basic plane are on the main sprue, while the other one has the pieces for the militarized version.
I suppose that a training only kit will be released, but I don't see hope to adapt it for the ambulance back. Probably the older kits will have to be kept good for that version.
That is the reason i bought IOM-kit U-2. Check lik i provided on first page of this thtread. While that one is on the level of bad knock off of KP kit it does have extra parts for limusin i.e. back with glass canopy (even tough it will have to be improved somewhat), parts for Hydro version (big central and small wing floats), NACA cowling, skies (not that great but still usefull) and bashkiev strecher pods (in only one of new KP boxes (box - P72012) Bashkiev pods and skies are also present and are somewhat better than IOM but these are still usefull).
;)Heh I will make an attempt in future telling. I see in my christal ball that stocks of Pavla sets for M-11 engines and big sets for U-2 together with excellent PART PE sets will become somewhat limited commodity.