Although this contradicts its long-held position against the Horde, Dalaran has been announced as the neutral city for the Wrath of the Lich King expansion, as Shattrath City was introduced as the neutral city for the "Burning Crusade" expansion.
One thing to take into consideration is that three of Dalaran's best wizards (Khadgar, Jaina, and Rhonin) have had dealings with the Horde in the past, and Antonidas studied the effects of the Orcs' lethargy extensively enough to know that they could be reasonable in the absence of their demonic bloodlust, explaining possibly why Dalaran could have dealings with the Horde, especially against a common enemy. Another factor to consider is that many Forsaken and Blood Elves were formerly citizens and even rulers of Dalaran.
As of the current phase of beta testing, the city contains areas that are faction-specific in the same manner as Shattrath is divided amongst Aldor and Scryers. Certain parts of the city can only be reached by Alliance players while others are strictly for Horde use. It is difficult to tell what will be in these sections as Dalaran is fairly rough at this time. The majority of the city remains neutral.
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