Im going to look at all the different zones and split them into 6 catagories, Alliance Owned, Alliance Favored, Neutral/contested, Horde Favored, Horde owned, not yet known This is just what im guessing (this isnt fact because im not in beta but based on the maps i can get the idea), BTW: This is from a lore standpoint
Alliance owned - 9
Dun Morogh
Duskwood
Elwynn Forest
Wetlands
Westfall
Teldrassil
Azuremyst Isle
Bloodmyst Isle
Loch Modan
Alliance Favored - 6
Blasted Lands
Duskwallow Marsh
Redridge Mountains
Southern Barrens
Darkshore
Feralas
Contested - 10
Arathi Highlands
Badlands
Eastern Plaguelands
Hinterlands
Searing Gorge
Gilneas
Ashenvale
Desolace
Felwood
Stonetalon Mountains
Horde Favored - 6
Alterac Mountains
Hillsbrad Foothills
Silverpine Forest
Western Plaguelands
Durotar
Ghostlands
Horde Owned - 8
Swamp of Sorrows
Azshara
Nothern Barrens
Mulgore
Thousand Needles
Tirisfal Glades
Eversong Woods
Lost Isles
Unknown
Tanaris
Stranglethorn Vale
Silithus
Un'goro Crater
Alliance Total Owned/Favored: 15
Horde Total Owned/Favored: 14
Contested: 10
Unknown so far: 4
So far the Alliance lore wise have more ground and land then the horde, not tons but more.