How long had the Tier 1 price been .99 € in those countries (Austria, Bulgaria, Estonia, France, and Slovakia)? Does anyone here know?
Apple usually isn't quick to raise prices following currency rate changes, it typically waits a while to (I presume) make sure the changes don't reverse quickly. But if that's been the price in those countries for a while, then Apple waited longer than I would have expected to adjust prices there. Customers in those countries have been getting a good price (i.e. relative to what customers in the U.S. have been paying) for more than two years now. At the exchange rates we've had since the beginning of 2015, they've been paying a fair bit less for apps than we have. It just goes to show that Apple doesn't rush to raise prices when the value of foreign currencies drops a little. They either have to drop a lot or the lowered rate has to persist for a while.
Also, does anyone know if the previous prices in those countries stepped up by 1 € for each tier? That is to say, was 19.99 € previously the price for Tier 20?