Most notable changes include a decrease to the tower repair rate of peasants, an experience raise for dryads and a reduction in the Necropolis' build time.

Also thrown into the equation was a chance in Bnet's map pool, which now includes Secret Valley which has been present in numerous tournaments for quite some time.

The full change log is as follows:

Patch 1.22


Features:

- There is now a replay auto-save feature in the options menu. Replays
   are automatically saved to the "replay" folder.
- The game is now automatically saved in the event of a potential
   disconnect. These saved games are placed in the "save" folder.
- Player color selection can now be limited by the number of players in
   the game using an option in the "Advanced Options" screen during game
   creation.
- Added an option to always show unit and building health bars.
- You can now enable and disable the display of minimap signals
   from players and other observers using chat commands:
   /showminimapsignals and /hideminimapsignals.
- Added a new in-game cheat "maxfps" to limit the maximum frame rate to
   the given number. Example: "maxfps 30" will set the maximum frame rate
   to 30 FPS.

Balance changes:

Human
- Scout Tower repair rate changed from 12 to 20.
- Knight damage increased: Attack cooldown changed from 1.50 to
   1.40 and base damage increased from 25 to 28 (Average damage is 34).

Undead
- Increased Ziggurat base armor from 1 to 5.
- Reduced the build time of the Necropolis from 120 to 100.

Night elf
- Reduce the Orb of venom poison duration from 10 seconds to 8 seconds.
- Increase the experience gain from Dryads from Level 2 (40xp) to
   Level 3 (60 xp).

Fixes:

- The cooldown on unlimited usable items (example: the staff of
   preservation) now persists after the item is dropped or traded.
- A cooldown exploit with potions has been fixed.
- When you unburrow a Crypt Fiend, its auto-cast will no longer be toggled
   off.
- An exploit bug in which items could lose their cooldowns when transferred
   between heroes has been fixed.
- Fixed DotA-specific sound effects on Intel Macs.
- Fixed sound falloff on Intel Macs. Distant sounds should now still be
  audible.

Maps:

- New maps from contest winners:
 - (2)MeltingValley
 - (2)RoadToStratholme
 - (4)CentaurGrove
 - (4)TidewaterGlades