Looked really good until I read this on the Kickstarter page:
"The heart of Longsword is in its online combat"

Zero interest any further.

As long as there is a proper story-driven solo campaign like they promised, I don't see a problem. I mean, one could easily say the same about the online multiplayer of Warcraft III. Was I supposed not to have enjoyed my time playing the story campaign there because of that?

I got stuck at the card packs, vanity items, and solo adventure packs stuff. If those are in-game microtransactions then they're likely looking at client dependency - trading on Steam was already mentioned. As pointed out, implementation will matter.

Game itself could be fun.

Ok, will give them the benefit of the doubt on that as Solo is mentioned once. However reading further:
"cards acquired through real-money purchases will be kept in your Steam Inventory"
"The business model for Longsword is that it ultimately will be free to play, and will generate income through the sale of packs of cards, vanity items for your miniatures, and through the sale of Solo Adventure packs. "
This all says online only, micro-transactions, pay to win, all components that are totally anathema to me, it does however mimic the GW setup without any actual physical content. Much like the Goblins Inc, Gwent stuff here. If they sold the game, and then you buy DLC then fine, but not in game market places, that only ever benefits one party and that aint the consumer.

Then I suppose you probably know about Wartile :)

There is a lot about this model that concernes me too. It's just that unlike something like Might & Magic Showdown there is single player content and a chance of it seeing a tolerable release. And in cases of games like these I'm more tolerant of microtransactions etc. since like you said, it does mimic the way such games always worked (if anything, it's the free-to-play basic setup that's a break from the tradition). I'm not throwing my money at the devs, nor do I ask others two, until we n\know more at least - I'm just pointing the game out as something with potential. Yep. Looks very good. I'm waiting for it to a) leave early access and b) be available not on on Steam.