Not to be the naysayer here...... But, that looks more like a knight to me than a titan.Look at the hips and you'll see surprising similarities to the errant and paladin. Even looking at how the legs are joined to the hip just looks like a reinforced castigator waist. Saying that though it does have the big or do titanicus symbol on its thigh armour...
Having watched the vid, it does appear beside the reaver for a few seconds and does look bigger than it
It does have two shoulder-mounted weapons, which is standard armament for all generations of Warlord Titan - Reavers only have one, and Warhounds (and Knights) none.To me it looks like they've moved away from the blocky version from 3rd edition Epic, towards a heavily modernized version of the "Beetleback" type from Adeptus Titanicus. That update involved picking up design cues from modern Knights, I suppose.
Aye she looks bigger than the reaver in the video.