I could see a few uses. These could help purchasing decisions for those that don't buy the complete seasons. I probably will buy season 2 if I like season 1 (my copy should be delivered today).
If you like Season 1, you will definitely like Season 2. More of the same, but with new and interesting mechanics introduced. If you want to get a feel for those heroes, you can go to the Kickstarter page where there are links to sneak peaks. However, it does appear they made more tweaks between those photos and production, so they're not exact.
These coud also be used as a Game Aid. Instead of looking at your opponents board, you could have a printout or mobile/pdf of their hero up. This would be especially helpful with status effects. Granted, I could just as my opponent, I get that.
This might be useful for the first few games with/against a hero, but you learn the boards and status tokens really fast and get to a point where you are familiar in no time. I'd honestly try playing the game a bit first when you get it and then decide if it's actually something you need after.