Robette: I still would be really surprised if it was Machinarium... it just has been around to long and been featured to frequently. It might just be naivety from my side but my impression so far was, that indiegamestand mostly avoids featuring games like that.
IGS has repeated a lot of deals from Indie Royale, Groupees, and occasionally Humble Bundle so it wouldn't be surprising to me for the new deal to be Machinarium. Machinarium is one of the most bundled indie games though, so you may be right, they might not feature it.
EDIT: Just counted and about half of the games they've featured were repeats of other bundles at the time of the sales.