Below you can see a changelog, which was made on 5.4.2 for one week, from 19.02.14 to 25.02.14:

General:

- Fix guild bonus http://wwww.wowhead.com/spell=83941
- Fix 9 reasons of server crash.

Dungeons and Raids:

- Fix bug, when can not see boss http://www.wowhead.com/npc=36497 in dungeon The Forge of Souls.
- Fix bug, when can not see boss http://www.wowhead.com/npc=25166 in dungeon Sunwell Plateau.

Imlemented new Cataclysm dungeons and raids:

Zul'Gurub.
Zul'Aman.
Baradin Hold.
Lost City of the Tol'vir.
Well of Eternity.
End Time.
Halls of Origination.

Spells:

Warlock:

- Now spell http://www.wowhead.com/spell=74434 correct works for spell http://www.wowhead.com/spell=689.
- Fix spell http://www.wowhead.com/spell=86664.
- Fix bug, when spell http://www.wowhead.com/spell=103964 not extending the duration of Corruption.
- Fix bug, when spell http://www.wowhead.com/spell=30108 not have silence when dispel.
- Fix spd scaling for spell http://www.wowhead.com/spell=103964.
- Fix spd scaling for spell http://www.wowhead.com/spell=124917.
- Fix spell http://www.wowhead.com/spell=109797.
- Now spell http://www.wowhead.com/spell=113861 correct add mastery.
- Fix spell http://www.wowhead.com/spell=86121.
- Now PvP-Power correct affect for spell http://www.wowhead.com/spell=689.
- Fix hp and damange warlock demons with talent http://www.wowhead.com/spell=108499.
- Fix http://www.wowhead.com/spell=57266.
- Fix http://www.wowhead.com/item=45779.

Druid:

- Fix spell http://www.wowhead.com/spell=145518.
- Fix set bonus http://www.wowhead.com/spell=144865.
- Fix http://www.wowhead.com/spell=77495.
- Fix double tick spell http://www.wowhead.com/spell=81262.
- Fix spell http://www.wowhead.com/spell=48500.
- Fix talent http://www.wowhead.com/spell=114107 in heal spec.
- Fix talent http://www.wowhead.com/spell=145108.
- Fix spell http://www.wowhead.com/spell=102351.
- Fix http://www.wowhead.com/item=40920.
- Fix http://www.wowhead.com/spell=56959.

Priest:

- Fix http://www.wowhead.com/item=79513.