What i have noticed since this update:
-good time for skillers that buys supplies
-bad time for those that sells supplies
Not sure about the buying part. Sellers might have a little fun searching for the highest price that they can get a trade at, but I dont find this price guessing game make buyer's life easier. Unless the skiller is someone rich and willing to spend like no tommorow.
I also find my plans for prayer training has been delayed as I know my stockpile of dragon bones is now worth 15% more than it was. I heard there are rumors on the internets suggesting that this is part of the "private server syndrome" and I am better off selling them, like now.
Other than that, trading doesnt really change. I still find myself buying at suggest price or slightly higher and selling at +5% (old ge max).