Since I'm pretty particular my list is likely to be shorter... I'm trying to think realistically on the matter too, so no "scale Falcon" or "Scale AT-AT" listings from me as much as I'd love to have either. Anyway, here's my list... Suffice it to say, I want everything to-scale as well... No cheating on things.
Prequals:
(I'm not counting "walking droids" in my list, just ones that roll on treads or fly, as they're more vehicle-like to me... The others are more like larger figures, like a giant Octupara droid I'd love, or the upcoming spider droid.)
-Droid "Snail" Tank Droid (Kashyyyk beaches)
-Droid Troop Transport (Episode 1 and Kashyyyk beaches)
-Droid Gunship
-Wookiee Catamaran
-AT-OT (built off an AT-TE frame)
-Dooku's Solar Sailer
-Neimoidian Shuttle
-Clone Swamp Speeder
-Palpatine's Shuttle
Original Trilogy:
-Cloud Car
-Lars Family Speeder
-Round Speeder thing (Mos Eisley streets)
-Yavin & Hoth Transport Sleds
-ANH:SE Swoop w/Rider
Resculpts (probably my longer list):
-Speederbike... (Smaller, more properly scaled with a "hover" clear stand for it)
-Snowspeeder... (Smaller, more detailed cockpit interior)
-Imperial AT-ST... (Hoth)
-Imperial AT-ST... (Endor)
-X-Wing... (Larger, more sturdy design, no "lights/sounds" features)
-Y-Wing... (Larger, removable droid)
-B-Wing... (Larger)
-Anakin's Speeder... (Larger, more detailed)
-Zam's Speeder... (Larger, more detailed and better designed)
-Outrider... (Definitely doable to-scale, it's not a big ship by any means).
-Slave-I... (Both OT and PT paintjobs for this to-scale beauty)
-Imp. Shuttle... (If all 3 wings were removalbe, it's incredible doable to-scale)
-ARC-170 Starfighter... (Larger)
-Republic Gunship... (Larger & new functional gunpods)
-Jabba's Skiff's... (Larger)
Expanded Universe:
-Kyle Katarn's Moldy Crow (Dark Forces/Jedi Knight series)
-Azzameen Family's YT Freighter Otana (X-Wing: Alliance)
-Z-95 Headhunter
-R-41 Starchaser (X-Wing/TIE Fighter series)
-Skipray Blastboat
-Bossk's Hound's Tooth
-IG-88's IG-1000
-Space Tug (X-Wing/TIE Fighter series)
-Stormtrooper Transport (X-Wing/TIE series)
-T-Wing Starfighter (X-Wing/TIE series)
-TIE Defender (X-Wing/TIE series)
-TIE "Avenger" Advanced (X-Wing/TIE series)
-TIE Phantom
-TIE "Boarder" Boarding Craft (omitted from ANH)
-Cygnus Assault "Starwing" Gunboat (X-Wing/TIE)
-Cygnus Missleboat (X-Wing/TIE)
-Assaj Ventress' "Fanblade" Fighter
-Slave II/Pursuer Class Vessel
-Rebel Light Hover Tank (Force Commander)
-Rebel Heavy Tracked Tank (Force Commander)
-Rebel Medium Hover Tank (Rogue Squadron)
-Rebel Mobile Proton Torp. Launcher (Force Commander)
-Rebel Hover Transport/Speeder (Force Commander)
-Rebel Combat Airspeeder w/rear Quad Gun (Force Commander)
-Rebel Combat Swoop (Force Commander)
-Imperial AT-PT (Force Commander/Various)
-Imperial Tank Patrol Droid (Rogue Squadron)
-Imperial Troop Transport-Ground (Force Commander)
-Imperial Charriot LAV (West End Games)
-Imperial Tracked Shield Disabler (Force Commander)
-Republic AT-XT (the actual precursor to the AT-ST)
-Republic Saber-Class Hovertank
And that's my list. I'd love lots of EU vehicles as there's an assload of good designs... Some not so good ones too. I left off probably a dozen fighter types from the X-Wing/TIE Fighter games there, some random vehicles you see in other games and EU... I am sure I could open up the old WEG RPG's and find a ton of fantastic designs I'd love to see to-scale some day... Force Commander was a wealth of great land-based vehicle designs too for the ALliance and Empire alike... I'm not anywhere near hopeful to see 99.9% of that list... A Defender seems to at least be on their radar though. I could see some of the CW vehicles coming out too. How could they pass on Ventress' Fanblade Fighter? It's such a wicked design I'd love to see... We're getting Torrent's so maybe the Fanblade has a shot.
Still though, most of those aren't anywhere even on their radar at this point. I'm much more hopeful on the resculpt list though, especially the Speederbike (which I've slipped into the Q&A and was well received

), the Snowspeeder, and the AT-ST.