While Relic made a great deal about unveiling an Ork campaign upon Retribution'sinitial announcement, they were also keen to point out that players will have the chance to command more than just Orks in Retribution's campaigns. What other races would be available, and how many, Relic left unanswered.
But today it has been revealed that Eldar will be getting a campaign as well. Details are just about completely lacking right now as all that has surfaced is a trailer on THQ TV originally shown at Games Day. One could say that the trailer offers nothing, but its presentation of and focus on Eldar in non-skirmish settings mimic what we saw for the Ork unveil, so knowing that multiple races are to have campaigns, it is only logical that this confirms the Eldar's place among those races.
Also notable in the trailer is the heavy emphasis on Wraithlords and the Avatar, which seems a bit of a departure from both the existing Dawn of War 2 Space Marine campaigns and what we have seen of the Retribution Ork campaign. Along with these, numerous Banshees are also visible, likely suggesting that Eldar will use unit training mechanics in the campaign as Orks will.
No doubt Relic and THQ will follow this reveal up with additional information and we'll keep you informed!