While the 2015 BRIO catalog has not been released yet, this year's new products have already started landing in stores in Europe. One thing that caught my eye is that the Roller Coast Set from last year was the beginning: BRIO has created a full Fun Park Theme. New so far this year are:
If you don't live in Europe, your best bet so far appears to be eBay. I've seen all of these items for sale with international shipping as an option.