Ok, I just spent the last hour going through all of the maps that aren't regulars maps we are all familiar with, and have compiled the following list by size and type.
One of the maps (Desert_Aim) is a duplicate of Toujane and should be removed since we already have it in the rotation.
Small Maps with little cover and easy spawn killing:
hyb_bunkers - small map easy spawn killing
Blimp_Egypt - small with some cover. Spawn killing not as bad on this one and a decent map
Destiny - this is a medium size with no cover
Frenzes - Large arena little to no cover
Gob_Arena - small map with cover but a really shitty map
Hawkeyeaim - small, rectangular spawn killers dream - great candidate for shotties or pistols only
jjs_aim - small arena easy spawn killing- great candidate for shotties or pistols only
killingzone - same as above - great candidate for shotties or pistols only
secretairfield - this is probably the worst spawn killing map we have. Would be much better with shotties or pistols
Street_Susux - small with 2 building on opposite sides of a mine field. More condusive to TDM
Volga - small map, little cover
Worldcup - small arena type. Lots of spawn killing if crowded
Xfirea - I didn't get to check this one out becuase of bad iwd files. Will look later
Larger Maps with lots of cover
mp_calvi - this map looks great! Can't wait to try it with a large group
carpen - large with many buildings
chelm - same
colditz - same
Dark_Forest_rain - large rectangular map with scattered trees for cover
Dark_Forest - same as above only in day light. Perhaps should be removed
Dead_End - Smaller map with lots of cover
dfg_crossfire - very large rectangular with buildings and trenches for cover
Downtown - old classic map that's always great
Draguignan - large with cover
Eisberg - large with some cover
Eraplace - smaller map with plenty of cover
Farm_Assault - Large/open with buildings
Flakbattery - large open fields with bushes/trenches and some building for cover
Freeman - huge map with many industrial buildings for cover
greenleas - Town map with buildings for cover
Harbor - always a great map that never gets old
Hf.d3 - very large shipyard map with many buildings
nijmegen - Smaller map with bridge over river and buildings on either side for cover
sdn.d3 - this is a good sniper map with building cover at both ends
street.d3 - medium sized map with many buildings
teleport square - large open map with teleports and no cover. Run & gun to the max
Walledin - looks very promising. Large with many buildings
Weihl - same as above
Canal_beta - Huge map with buldings and river. Good sniper map
Panzer_station - huge underground bunker with lots of cover