Sorry I don't have any videos, but nevertheless I have some interesting tactics that I came up with in tandem with the new weapons. (All tested on testmap6p_FiringRangeV2 on Hell on Earth.)
For the Berserker:
Those who like to go solo play or even in a team setting, here's a loadout that might interest you.
> Claymore + Trenchgun
Claymore for anything and scrake removal and fleshpound kiting (due to it's lower head multiplier of 1.1 even though its altfire does more damage than the axe's.) The Trenchgun can ALSO be used for trash specimens and fleshpound kiting. Yes, you heard me, fleshpound removal. While inefficient and uses up a decent number of shells (a total of 18 bodyshots to kill the FP solely with the Trenchgun), you can use the trenchgun to set the FP on fire and run away and stay out of his line of sight, make sure that you fire only after he crisps up and he is no longer burning, and headshots do not rage him though it's easier to just bodyshot (less risk). The sticking point is that you can use this tactic to kite fleshpounds when you're at a distance and can't get close enough to engage him because he's surrounded by his posse of zed meat-shields.
> Katana + Axe + Flare Revolver + M79 or any combination with a Flare Revolver
The best thing about this loadout or any berserker loadout involving the flare revolver is that 1 shot from the flare revolver offperk will kill those pesky crawlers in 1 shot. It helps to provide more interesting loadouts than the standard Katana/FireAxe/LAR or Claymore/LAR and Mk.23 or .44 Magnums aren't worth getting since you can 1shot crawlers with the flare revolver.
For the Firebug:
For Scrake removal, this loadout comes in handy and can be tricky.
> Huskgun + dual Flare Revolvers
Using the Huskgun's fully-charged shot, stun a scrake in close promixity and then switch to your dual flare revolvers and spam them right up in his face/body. Use all 12 rounds for the safest result and back away. What happens is that he crisps up (still flaming) and dies a few seconds after you're finished firing. Very handy tactic.
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If anyone has interesting new tactics with the new weapons, please contribute! I'm interested to see what others come up with, including the buzzsaw xbow and the Vlad the Impaler Nailgun. (I have yet to come up with something neat for those guns.)