Marvel Multiverse Role-Playing Game: Playtest Rulebook - Kindle edition by Various, Various, Various. Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading Marvel Multiverse Role-Playing Game: Playtest...
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I don't think it's a red flag at all - it's to build up hype for the game. They're putting it on comic book store shelves and to get the store owners to put it on their shelves they need to have the product be for pay. It's how the comics market works and they're trying to leverage the comics market share that they have into their game. Plus it gets a starter version of the game into people's hands who wouldn't see it even if it was offered as a free download. We'll see what the binding looks like but I suspect it's more "comic book" than "rpg" in appearance.
I suspect that's also why they got Matt Forbeck to write a new d6 system for it rather than anything else. They want the game to be easy to get into the hands of new players and making people go buy a d20 probably won't happen, but people can easily scavenge their Yahtzee sets for 3 dice (plus then you get to name it the 616 system, and who wouldn't want to do that?)