I'm a little disturbed by the scene starting at 0:30: With the whatever machine, converter or portal.
I always viewed charr as capable of using steam, heat or mechanics but I never considered being able to use electricity. I mean, if they were, they would basically have laser guns, phaser rifles or well, electric torches. The recent episode of drizzlewood included things like propaganda speakers, or electro-magnetic pulse charges, even remote bombs. So conceding that charr now about electricity, making emitter or wireless antennas. Even the recent vision of the past included a radio in the tank.
But I dunno why, it feels off. In grothmar, the metal legion had amps, but it was explained by the asura technician. Also the spy devices were surely made my separatists or renegades and so possible stolen technologies. But for charrs, core tyria charr, I always considered they were just able to use steam, gears and wires to make engines, pumps or metal siege engines but nothing more. The airship as example, it moves and float only thanks to the asura repulsors and turbine at the back of the airship.
The trailer, now assume that, charr know how to manipulate draconic essences, which is an aberration, the device is high tech and highly remind me the clockheart containment cell in aetherpath or the ones used by aetherblade in general. I highly doubt there is any asura there (Well possible Inquest to study Jormag (think of test bed zeleph for zhaithan, base in dragon stand or sandswept)), also I highly doubt there were an aetherblade base here. It even have some holographic part in it.... If you pay attention, it even have some holo-ball generators around.
Sure, they introduced in the third episode, a secret facility developing new weapons, "never saw before" but I highly doubt that Jormag has any knowledge into technologies, and even how to extract its own essence! Plus, I don't imagine sons of svanir being created in a "lab" passing through a gate! Can't those charr convert themselves by performing a group ritual? They obviously met sons of svanir, why not asking them? Jormag have in its army in majority, Norn and Charr, with some kodans. Through kodans have respectable knowledge I doubt they have very strong abilities into telling how again, to play with essences. The process of worshipping is too slow? I can get it if jormag capture a random asura knowing about all of that, but i really feel this is a very stretched hypothesis, and that having an essence infuser is kinda a joke. it's either, you modernize everything, or nothing. I never saw again, even recently, charr equipped with a tazer chestplate, throwing sparks arks or whatever (haha, btw that description would be aetherblade). Well apart EMG and remote charge, but I still wonder how they know about that. In core story, I get the remote things, because it is a coalition of races and so no doubt an human could have come showing how to make detonator. through, note that the tonn story or the one to destroy a risen tower included both an asura, in charge of the detonation.
But if anybody can affirm that charr, since core, know about electricity and how to use it, I'm very interested. Even streetlamps in Black citadel are flames.