Looks like funding dried up:
IndyCar opener in Brazil has been canceled
Foreign (non USA) races for Champcar/CART/IndyCar have always been a hard sell. The series, while popular in the USA, is a harder sell overseas. Australia, Germany, England and Mexico have all been on the schedule before for the previous series but are not presently on the docket. Overseas races seem like they are hard on promoters because they always claim to make very little (if any) off of the races themselves. Just look to the F1 races being promoted in Europe. Seems like every promoter states the deal they struck is a losing proposition. Good for the local economy but no profit for the promoters.
Checking the schedule for 2015, Toronto is the only non USA race. Brazil would have been nice, but IndyCar needs to focus on what it does well (oval races) and build from there. Maybe in the future we will see more races on foreign shores, but for now, the USA (and Canada) will be the only places to watch the best racing (outside of MotoGP) in the world.
edit: looks like both Neilk and I posted the same article.