User blog comment:LilyheartsLightning/Citadel and Reckoning DLC announced/@comment-3062992-20130223121810/@comment-24174486-20130223132119

There's no indication of what the Lancer is, although I have seen speculation that the Lancer will be an upgraded version of the Avenger.

If it is, it'd better be in Citadel if BioWare knows what's good for them.