As for the 2 protagonists thing, I thought it was interesting and fun, but I'm curious to see how it will work when you get into the different branching paths. It looks like the too protagonists are sort of destined to be together, but the way as I was playing it I was setting them each up with different people. If you send each of them down a different route, I wonder how the Ian-Lena interactions will be handled in the future. It seems like it would create two totally separate games.
I thought exactly the same, which I also chose to comment on the post where Eva released the game. I had the feeling that we were playing Lena and Ian's story, as if it has already happened and we are simply watching how their current situation came to be.
This is the main problem I see in two MC's, and I'd be lying if I said I'm not worried about what the effects will be on character development and story variation. Clearly, if we are playing "their story", then the opportunities to affect where they end up is limited. At the same time, if we are supposed to be able to influence everything for the two characters, the story could become disintegrated. And if this wasn't enough, there is already a natural trade-off when having to MC's, in the sense that the possibilities for each character is reduced because content has to be made for the other character.
As someone who prefers the female MC in this instance, I fear that we won't be able to take Lena as far as we want her, and that there will be less variety compared to GGGB. This would be a step backwards, in my opinion. Perhaps this is also why I liked Lena's set-up, because the distance to heavy corruption is shortened. But there is still the question how "set" her path is, because of the relation to Ian.