I confirmed the Combat Roll/Coming Through double damage and status recovery (for knockback, anyway).
2H Qunari Champ, respec'd to minimum skills (Pommel Strike and Combat Roll with upgrades), NM with no Trials. 91 AoE sword (low tier), 14% Attack vs. Ghoul (Western Approach) with 46 armor.
Expected damage of Pommel Strike/Lightning Jab (300% + 200%): (91 - 46)(1.14)(1 + 5) = 307
Expected damage of Coming Through (250%): (91 - 46)(1.14)(1 + 2.5) = 180
Three trials of Pommel Strike: 288, 270, 246
Three trials of Coming Through: 288, 264, 278
I then went to the Hinterlands and annoyed some Druffalo at the farm enough for them to Charging Bull me for knockback. Coming Through instantly recovered from knockback. Better yet, you can Combat Roll through multiple enemies (Druffalo) and damage all of them.
As they say in Mythbusters: CONFIRMED!