Happy V-E day.
I too would like a med/balkans add-on (the existing planeset of CoD would already be good for that, add some 1942 aircraft that will double for the channel front '42 time period and you've got both Africa/Med and NW Europe covered up until 43) but on the other hand i also want to experience the eastern front campaigns with the capabilities of the new engine.
It will be a blast with the new damage modeling and CEM, flying those temperamental early war VVS planes or strafing armored columns in a sturmovik across the steppes.
And like others said, it makes sense to keep your artists busy with the next add-on while the coders focus on the bugs in the current version, it only saves time in the long run.