If you missed the news, United is lowering the value of their mileage currency on February 1, 2014. The main area of impact is international premium cabin rewards, with those flights on United metal going up in price slightly, but flights on partners going up significantly.
Be sure and book your rewards soon if you want the lower prices. After February 1, 2014, any change to an award that requires the ticket to be reissued has the potential to be repriced at the new reward levels. I do have a prediction: the implementation/roll-out of this new price reward chart is not going to go off without a hitch.
If you want more information on the devaluation and what different flights will cost, Seth has a great breakdown here.