The number of Power Ball numbers to choose from will decrease from 39 to 35. That will raise the odds of winning from 1 in 192 million to 1 in 175 million.
http://heraldnews.suntimes.com/news/9772544-418/pricey-picks-powerball-tickets-doubling-to-2.html
Your probabilities will drop by almost half for the same amount of money spent.