HL2 files have released 2 mappacks of pure crappieness, each with 50 maps included. expect to see 99 killbox clones.
i say 99, as tundra_cool has made boot_camp_tundra_cool and I know hes no noob to mapping...
heres mappack 1 containing, and i quote:
3rooms, alyx_basketball-b2, barney_gulch, bounce, buildingblocks_b1, buildingblocks_b2, cf_mechwars, cityseventeen_com, convex, crossfire2, db_bunker, discarded_garage, discarded_garage_V2, dm_abandoned_factory, dm_arene_kn, dm_assault, dm_backyard, dm_crossfire, dm_crossfire2_b2, dm_datacore_b1, dm_deathbox7b, dm_dustforce, dm_killbox_beta3, dm_rally_b1a, dm_rally_b2, dm_reactor, dm_unrealstation_B1, domino_effect, e3_c17_01, fall, fy_iceworld, fy_race, highway, hl2_lobby2, hl2dm_arena, hl2dm_petrol, killbox2, nm_motel_dm, playground, prison_grav, rocked_arena, sdk_vehicles, sdk_vehicles_b, station, taz_barrel_launcher, temple2, templev1, xenon_engage, xenon_roofrumblev2, zombies.
and mappack 2:
alpha6, apc_bunker, boot_camp, boot_camp_tundra_cool, buildingblocks_b3, deadclan, dissipated_beta1, dm_abandoned, dm_airboat_swamp_b1, dm_arena_duel, dm_bounce_b1, dm_buggy_kn, dm_bunker_valley, dm_burn01, dm_cabinfever, dm_chaintech, dm_chamber, dm_city, dm_closed, dm_concretebunker, dm_creighter, dm_dodgeball-b1, dm_exit, dm_ffm7beta16, dm_frag_dodgeball_v1, dm_freeman, dm_garage, dm_ghtemple_a09, dm_hanger18, dm_kasasu, dm_killbox_final, dm_quad, dm_racetrack, dm_sawblade, dm_urban_siege, dm_waterhazard, dodgeballmkx2, evn_physics_b2, Greentownforest, hl2dm_arena_1a, hl2dm_tower_1a, lws_train1, neighbour-war, phys_ozone, piff, robotwars, robotwars_v3, skyhigh, storage_hq, zombiesv2
no doubt, several of those dont have spawn points :/.
[addsig]





Valve most likely wouldn't be aware of the fact
its been leaked out there, and you still have plenty of time to make it
significantly different to the release that is out there. Even if they
did realise it was somewhat released already, I'm sure they would
understand your plight - its hardly like you are trying to shove in a
map you had already made or something. Hope it all works out mate 