According to the Dividend Miles Member Guide, the fee for award ticket changes and for ticket cancellation/mileage redeposit is $150.
Up until a few days ago it was a stratospheric $250 per passenger on international itineraries ($150 domestic).
This change brings US Airways in line with American and United.
It’s still not inexpensive, but it’s a meaningful reduction of $100 per passenger, without explanation or fanfare. I’ll take it!