In this version (the 1.7.3) the changelog is really great, with additions and modifications that range from the addition of new images to fix the bug really annoying!
* AI:
* New AI configuration syntax
* Campaigns:
* Two Brothers
* Replaced campaign specific portraits with mainline portraits
* Under the Burning Suns
* Fixed bug #13978: UtBS: “stun” ability doesn’t modify enemy ZoC
* Legend of Wesmere
* Story only scenarios now display the speaker’s name in the title.
* Ambient sound effects.
* Redone the campaign’s objectives.
* Added the “Dwarfish Scout” to the player’s recruit list.
* Scenario 19 now requires the player to destroy Saurgrath.
* Scenario 14 redesigned.
* Scenario 23 implemented Santi’s plan to let half the army defect.
* Map updates (mostly new alias terrains added).
* Replaced the campaign image with a transparent one (Thanks to Kitty).
* Editor:
* Renamed editor2 to editor pretty much everywhere
* Graphics:
* New portrait for the Duelist, Mermaid Enchantress/Siren, Priestess/Diviner, Merman Fighter/Warrior, Fencer, Drake Glider, Merman Hoplite, Goblin Impaler, Rouser, Merman Triton, Cavalier, Direwolf Rider, Paladin, Deathblade, Thug, Bandit, alternate Goblin Rouser, Revenant, Naga Fighter, Troll.
* New unit graphics and animations for the Troll Hero, Drake Glider, Sky Drake, Hurricane Drake, Drake Burner, Drake Fighter, Drake Warrior.
* Language and i18n:
* Updated translations: Czech, Dutch, Estonian, French, German, Hungarian, Lithuanian, Polish, Slovak
* Updated Drake Clasher, Arbiter and Slasher descriptions.
* Multiplayer:
* Added a /q alias for /query
* New lobby interface in gui2, testable work in progress available with –new-widgets. There are known issues with window resizing and low resolution support.
* Server-side generation of random numbers for MP (combats)
* No MP compatibility with earlier clients and wesnothd
* –no-srng command line switch is available to turn off server RNG support (and rquirement) in a client. Only games played with clients pre-srng or with srng disabled as well can work without OOS. This is a testing feature that will likely be removed prior to 1.8.
* Room support via /join and /room commands, better support in the experimental new lobby. See http://www.wesnoth.org/wiki/MultiplayerRooms for details.
* Multiplayer server:
* Added server-side RNG support. Old clients can still play as normal.
* Added room support to the server.
* Unit balancing:
* Added Dwarvish Stalwart, Elder Wose, Shock Trooper and White Mage to random_leader of the default era.
* Added Ancient Wose, Dwarvish Sentinel, Iron Mauler and Mage of Light to random_leader of the AoH era.
* Unit renames:
* Drake Gladiator -> Drake Thrasher
* Drake Slasher -> Drake Arbiter
* WML Engine:
* return 0 for length of arrays inside nonexistent containers (bug #13734)
* [end_turn] now waits for the event to finish before ending the turn
* it is now possible to use Pango markup in storyscreen text
* it is now possible to specify a custom title= in [story] [part]s
* [story] [part]s’ text placement may be changed with text_layout=; it currently supports “top”, “middle” and “bottom” (default)
* [story] [part]s accept the sound= attribute for a list of sound files from which a single one is chosen and played once
* [story] [part]s accept a caption= attribute as a text header
* new tags [store_unit_type] and [store_unit_type_ids] were added
* allow direct WML unit modification of “halo” attribute
* Miscellaneous and bugfixes:
* [music], [sound], [sound_source] and [label] should work again on WML prestart events; this means most music playlists should work again (bug #14039)
* ‘Recruit’ and ‘recall’ don’t appear in context menus unless the leader is on a keep. (bug #13856 and #13855)
* No longer “crash” upon invalid pango markup
* It’s now possible to display the area a widget uses, for debug purposes
* The widget in a stacked widget now grows properly
* Merged code for FDO and KDE desktop notification; only dbus is needed
* Added –screenshot parameter to take map screenshots without initializing a GUI.
* Added –new-uploader parameter for testing the new experimental log uploader.
* Fix gcc 4.4 compilation errors (Debian bug #539546)
* Added a work-around a listbox assertion failure in the new MP lobby
As usual, I remind everyone that the packages can be downloaded from here for those who do not wish to add the repository, while for those who added the repo (or want to add) just to upgrade the system.
Let me add my thanks to all who pass by here and try to understand what I write in my ungrammatical English. 
1.7.15 aka 1.8rc1
1.8.2