Crosmando: Given the amount of people wearing plate armor in the trailer, I doubt it's that realistic, in the middle-ages only the richest of nobles could afford plate.
The developer's vision of "historic reality" is basically reductive. It's not about what this game has, it's about what this game does without. Overt fantasy elements, women in any kind of prominent roles, minorities, excessive amounts of gore. Which is OK by me. The developer knows well enough that "realism" in games is bullshit as a means to itself. The prevalence of plate or the artifice of rule governed fencing are just something people have to go along with. If the resulting blandness is what enables the developer to keep his Steven Seagal level conspiracy bollocks to himself, he can call his game "accurate" for all I care. But strictly speaking, it will in no way be more "historically accurate" than e.g. the Witcher was.
fronzelneekburm: The two-week delay is an absolute blessing in disguise: By the time the gog version launches, there will be plenty of player feedback and reviews. You'll get a more up-to-date build, you'll have reviews and you can still get your pre-order perks, even though the game launched already. I see nothing but positives here.
No accusation to the developer regarding the delay between Steam and GOG release. I'm willing to bet this is the usual Koch Media contractual clusterfuckery. But if this turns out to be a Gothic 3 type release (and hot damn these games look similar), two weeks will not be enough to pierce overly favorable reviews from the usual sources who judge a pre-release build. Two weeks will not at all suffice to patch out the most fatal bugs. But two weeks will be more than enough to make people hop from GOG to Steam and possibly even reinforce the developer's notion about what version to update and what version not to update.
I mean, I do see some positives, but won't characterise the two week delay a win-win.