I agree, I think the marketing bonanza is going to be high... Still, I think that a toy line can be supported by adults too... This Indy line I think will have legs with even an adult market as its core, including vehicles. Playsets are what they are, and not likely IMO, but I could see the German truck, German motorcycles (tan and grey), Arabian Horse(s), maybe the WW1 styled tank from TLC, possibly a Kubelwaggen or staff car... All doable, small vehicles really, save for the tank.
Indy, I think more than other lines even, really works well with playsets... Traps and things would work well in the playset format, but I'm just not hopeful that we'll see any with this line.
Either way I'm more than pumped to see the figures, and can't wait to pick them up. Between wanting the line itself and the parts for customizing, it's a line I'm full into right now.
And with the military line I collect, I really hope they do things like a German bike or the German truck... If done to-scale I'd buy multiples of both quite happily. I can't imagine the license to this line cost what the Star Wars one did, so I think Hasbro may be able to take the gloves off and really do some nice stuff without the heavy licensing restrictions Star Wars seemingly puts into that line.