There will certainly be some gameplay videos released and maybe even soon, so just copypasting what I mentioned on IRC (so that Locki doesn’t forget :))
For one gameplay video one could for example use a scene with a covops sniper zooming and popping two heads off in a row, a scene with an engineer repairing a turret (which isn’t available yet tho), a scene with a demoman exploding pipetrap and mirv (a possible new class) or planting a C4, a scene with a soldier with a rotating gatling gun (instead of minimi)… This could possibly attract attention of thousands of bored TF2 players.
For another video, one could use a scene of a pair of a medic and engie escorting the EV, a scene with engy disarming a C4, a scene of a fieldops placing laser beam for an airstrike, a scene with a covops in disguise (not implemented yet) viciously backstabbing (with loud death sound) someone, a scene with players using iron sight shooting and making headshots - this could stimulate an interest of ETQW players.
In yet another video, one could capture a team effort with several players storming some objective, medics reviving teammates near it, players hip-firing and crouching, free fast paced movement over map, perhaps some trickjumping - this will perhaps warm up the hearts of W:ET players.
For Brink players one could depict the female models, tattoos and generally all different player models, various guns and cool map areas, as well as shooting from some SMGs with high ROF.
As for fans of the CoD, BF, CS and other similarly silly games - I have no idea
But I guesss they are also needed, just for the business model
Any other typical SD gameplay stuff I forgot? Type it in!