Here's a summary of the main changes in DOFUS 2.7:

A new class is emerging! The Foggernauts, acolytes of an ancient culture, have risen up from the bottom of the oceans. They have mastered the intricacies of steam engines and their combat skills are based around three turrets with unique abilities. This class will only be playable by DOFUS Premium members (players who have purchased the DOFUS Collector’s Box) and those who have purchased the first issue of our new digital DOFUS Magazine, until their final release on July 27, 2012.
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The difficulty of fighting in dungeons will now be adapted to the number of characters in a group on the fly.
The more characters in a group, the more monsters they will have to defeat to win and vice versa. This new system
allows players who might have trouble finding full groups to run dungeons more easily.
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Nearly all of the dungeons in DOFUS have been revised and now all have a similar length and construction: four monster fights and then a boss fight. Older, longer dungeons have become shorter and more accessible.

Several new quests have been added to the Sufokia area; some can be repeated daily.

Several improvements have been made to various DOFUS interfaces. In particular, the world map has been streamlined for faster loading. The major interface buttons under the item and spell bars may now be rearranged to suit the needs of the user, and finally, several new advanced transfer options were added to help you easily manage your bank and chests.
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Amakna, Sufokia, and the Dreggon Peninsula have received a facelift. The level design team has created beautiful new backgrounds for these areas with more detail and character. Sufokia now has its own Zaap, as well as a series of Zaapies for easy transportation in the city. Several dungeons have also been improved in the graphics department.
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Several Sacrier spells have been revised
to remove inbalances that were present in PvM and PvP.
However, several of their spells have been given boosts
to aid the Sacrier who plays solo or in small groups.
Enutrofs and Pandawas have also undergone some changes.
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To help you better express yourself, more that 60 new emoticons have been added to the game. Emoticons will also be slightly larger when shown above the heads of characters.