This changelog is a work in progress, since we havn't reached a final build of 1.9.1 yet. I'll post changes in new posts if we make a change that we decide to keep, along with updating this original post to include the change(s).
Code:
Fixed
-Players spawning at enemy spawn area.
-Bug in spawn code that caused telefragging on spawn.
-Crash on block destruction while being frozen.
-Flag getting "stuck" to a player after multiple flag drops.
-Ammo crates staying open longer than normal when used twice in a row.
-Game name being reported as "Half-Life 2 Deathmatch" on Metamod.
-Players not being able to freeze long-flat blocks in combat from certain angles.
-Players not seeing sparks emitted from their freezing/unfreezing process in combat.
-Physics bug allowing players to "fly" in combat.
Added
-Class limit system
System functions by only allowing a certain percentage of a given class to exist at once. Players attempting to become a "full" class will be denied.
Scout - 100% (no limit)
Engineer - 75%
Soldier - 66%
Rocketeer - 60%
Sniper - 25%
-New ammocrate model.
-New menu backgrounds.
-Music on menu screen (optional).
-Icon for Steam's "My Games" menu.
-"Red/Blue team wins!" banner on end of game.
-Announcer sound when flag is dropped.
-New art for team and class menus.
-Block LOD (level of detail) models.
-Physics damage in combat.
Changed
-Flag status HUD shows name of player carrying flag if taken.
-Damage multiplier on unfrozen blocks to allow unfrozen blocks to take more damage before "dying".
-All loose blocks freeze on end of build round, unless block is in a no-freeze zone.
-Grenade throwing distance lowered by 20%.
-Manual flagdrop drops flag from the waist in front of the player, rather than from the head back onto the head. Check is made for obstructions between player and drop point (to prevent dropping through walls).
-Health charger amount per use increased by 50%.
-Armor charger amount per use increased by 50%.
Class changes
Engineer (previously "Builder")
-Can now use mouse1 to punt carried blocks in combat.
-Blocks become temporarily frozen while in the freezing process.
-Carried blocks can be shot out of an Engineer's grasp, except when crouching.
-Can heal and repair players with the gravity gun with the "use" key (default is "e").
Soldier
-AR2 (pulse rifle) does 20% less damage.
-Accuracy of shots fired from the AR2 degrades over distance.
Maps
-Added sf_city
-Added sf_deck2
-Updated sf_tactical to fix the behavior of the build walls when a team controls a switch.
-Updated sf_rooftop to allow players access to both sides of the map without building.
-Updated sf_nowhere to accommodate for block deleter and more appropriate player spawn area.
-Updated sf_platform
-Added cubemaps to sf_valley.
-Added cubemaps to sf_fieldtrip.