New footage of Mark of the Assassin DLC can be seen in Felicia Day's interview with GT.TV In the previews brief clips of Day's character Tallis fighting alongside Hawke are shown as well as possible Wyvern fighting abilities.
Felicia Day introduces Dragon Age 2 Mark of the Assassin DLC
If you'd like to read the entire article here it is:D http://biowarefans.com/2011/09/new-dragon-age-2-dlc-announced-mark-of-the-assassin/