Eurogamer has the first English review of Spellforce 2: Dragon Storm that we've noticed.  The text is generally positive although there are no exciting additions, so the result is a "palatable" 6/10:

If you've played through the SpellForce series, you'll know that SpellForce 2 pushed the game more towards the RPG elements and away from the RTS base-building (without abandoning the latter completely). Dragon Storm pushes even further in this direction, often presenting you with maps which are tackled by your small party of heroes as opposed to an army of troops. When bases are involved they're largely pre-constructed, and the game takes a completely different tack on army building in some missions. For example, the aforementioned General Redmond's problem this time around is that his troops are besieged and starving. If you can get food to him, some of his men will recover their strength and fight for you, and there are two different ways to acquire the necessary rations to bolster your ranks - take to the wilds and hunt game, or raid an enemy supply convoy.

JoWood and Deep Silver have announced the Spellforce 2 expansion Dragon Storm is now available for preload through their digital delivery partner Buy&Download (catchy name).  Apparently buyers will be able to activate on the 22nd (23:00 GMT).

Five screens from Phenomic's Spellforce 2 expansion Dragon Storm are available at Worthplaying.

3D Gamers has a collection of new screens from Phenomic's Spellforce 2 expansion, Dragon Storm.

Koch Media just sent out a PR setting the release date for the Spellforce 2 expansion Dragon Storm to March 27^th 2007 in German speaking territories, other countries still just have a Q1/2007 date.

GamesIndustry.biz has an announcement from JoWood setting the release date for Spellforce 2: Dragon Storm at Q1 2007:

Liezen, Austria, Oktober 18th 2006; Publisher JoWooD Productions and Developer Phenomic announce the release of the official AddOn for SpellForce 2 – Shadow Wars for the first quarter 2007.

Continuing the success of the series of SpellForce titles JoWooD Productions brought a new star to the gamesheaven; SpellForce 2 - providing great gameplay, highest technnical qualities wich resulted in a great reception from international games press and the fans of the SpellForce-series alike. Phenomic have been working on SpellForce 2 – Dragon Storm for some time now and will provide a fantastic expansion to the fascinating RTS/RPG Hit.