According to Eyonix on the official forums:
With the release of Wrath of the Lich King approaching, we wanted to provide you with some important information. In preparation for the expansion, we will be issuing a new content patch in the coming weeks. Much like the patch made available shortly before The Burning Crusade's release, this content patch is designed to bridge current game content with that of the expansion and will contain some exciting changes and additions.
We have outlined some of the larger features scheduled to release with the patch below:
New class spells and talents
Barbershops in capital cities
Zeppelin towers outside of Orgrimmar and Tirisfal Glades
Two brand-new Arenas featuring challenging new layouts, terrain hazards, and moving obstacles
Hunter pet skill revamp
New profession: Inscription
As mentioned above, this is not a comprehensive list, just some of the major highlights. We’ll post the full patch notes as soon as they’re available. Regarding Inscription, please note that all Burning Crusade players will be able to select Inscription as one of their two professions and level up to a skill level of 375 with it. Upon the release of Wrath of the Lich King, players who purchase and install the expansion will be able to continue leveling in Inscription and the other professions beyond 375.
I find alot of this interesting, and it is quite similar to the 2.0 patch before Burning Crusade. Getting our new talents will make raiding more interesting, the specs being more defined. I also think allowing Inscription into the game early is going to make herb prices go through the roof, so get your herbers out there to stockpile, and sell the day the patch hits. Make alot of extra gold that way.