This is not meant to be a closed list, on the contrary it's meant to receive suggestions of new scenarios. I will be collecting the votes casted by people and updating this post accordingly.
1) Operation Uranus-Saturn 42, covering initial Soviet offensives, Wintergewitter and the battles over the Chir river line. (work in progress: el hefe, scenario in the works "Red Army Resurgent")
2) Wintergewitter/Saturn (variant of the above after Stalingrad encirclement has been already achieved)
3) Operation Mars 42
4) Retreat from Leningrad, AGN campaigning during Spring-Autumn 44 (work in progress: el hefe).
5) Korsun Pocket 44 (work in progress: bcgames)
6) Bagration 44, depicting the AGC battles, variants covering what-if situations where German High Command wasn't deceived by Soviet maskirovka would be very interesting. (planning: el hefe).
7) Kharkov Early 43 (the famed Von Manstein's "backhand blow")
8) AG South Ukraine successful defense in March-April 1944 (one of the Eastern Front "forgotten battles")
9) Kursk 43, covering initial offensive by the Wehrmacht (work in progress: Don).
10) Race to the Dniepr 43 the post-Kursk battles over Northern Ukraine (work in progress: Don).
11) Ukraine 43-44, covering AG North and South Ukraine late 43 - early 44(?) battles (work in progress: el hefe).
12) Wintergewitter & Chir Battles: Smaller version of 2) covering Manstein effort to relieve Stalingrad as well as the defense of the Chir river and Luftwaffe airfields.
13) Operation Star 1943: Voronezh Front offensive to recapture Kursk and Voronezh
14) Operation Gallop 1943: Konev (?) offensive to recapture Voroshilovgrad
15) Ironman Campaign scenarios: Covering what-if's either exclusively or combined
- Germany featuring a fully mobilized war economy in 1941
- Red Army forces deployed in a slightly more sensible way on 22nd June 1941
- Soviet pre-war doctrine implemented more in depth but with less breadth (i.e. less mechanized corps but better trained, morale, supplies and with full TOEs).
Votes:
1) 1
2) 1
3) 3
4) 2
5) 1
6) 1
7) 2
8) 1
9) 1
10) 2
11) 2
12) 1
13) 1
14) 1
15) 1
PS: Merry x-mas to everyone!

EDIT: I had forgotten about this thread guys, sorry [8|]