The game is (likely) well worth the money be it by preorder or post-release purchase for the art, gameplay and story, so it had no impact on my decision. In my opinion, they would have been better off emphasising these aspects to imply that the game is
different, as opposed to giving the impression that they are preparing the industry-standard hidden-costs-DLC-hell (because I don't think that's the case). My point was that it makes Stoic appear worse than they are, and might have been a mistake independent of their intentions since it could scare people away.
The discount is a decent incentive to preorder (in addition to how awesomely promising the game looks!), while the additional* content has been stated to be irrelevant for the game experience, hence seems slightly dishonest as part of the
Insane Viking Pack. Additionally the restriction of this irrelevant content to people who buy the game post-release seems rather pointless.. and if they proceed to release it as DLC later, they will definitely lose some respect with me, but I'm not going to make that assumption! I just wanted to point it out so that they could refrain from it in the future.
* It's obviously not really additional since it is ready on release, i.e. rather a restriction on the post-release version (which, to repeat myself, I find counter-productive).