Ok, I know this is just pure speculation... but I'd think that a few of us are going to be lucky and find a few Indy toys before the street date (5/1, right?).
By my past experience, Wal-Mart, TRU and Target are all pretty tight on street dates for launches of a new line like this. I've heard of a few hiccups, but I doubt I'll be able to score anything at those locations.
In about a week or two though, I'm going to start checking K-Mart... they're the one retailer that I remember put out all their ROTS toys about 10 days early and sold them for a day, only to put them back in the stockroom when word got out that they were selling them too early. I'm thinking a few K-Marts might have a similar slip on these too (they did for AOTC and EPI too in my area, but not to the point of them setting the entire section up like they did for ROTS).