"newly decided" is a correct and usable phrase in written English.
You can use it when you want to express that something was recently decided or made known. For example: "The newly decided policy will come into effect this weekend."
The court has, however, frequently addressed virtually the same question in determining whether to give retroactive effect to newly decided cases in the habeas corpus context.
At a time when abortion rights and women's access to affordable contraception are threatened by political attacks, judges in three newly decided federal cases failed to preserve constitutional protections for women.
The borders of Albania again became the cause of international conflict when Italian General Enrico Tellini and four of his assistants were ambushed and killed on 24 August 1923 while marking out the newly decided border between Greece and Albania.
Sasha Brown-Worsham at the Stir blog points out that this newly decided children's author is the same man who stood before a couple hundred people last summer and angrily yelled for a U.S. congressman to "stay away from my kids".
Instead, Ms. Parker-Barker, newly married, decided to move back to Utah, to be closer to the couple's families.
At the end of the First World War Alleg's newly married parents decided to follow the well-trodden path to a new life in the United States, but first went to Paris for their honeymoon.
In the end, the newly arrived couple decided to go with Wajid.
As a result, the newly formed Student Justice Coalition decided to organize a forum and invite a speaker to address their concerns.
SOON after the newly reunified Germany decided, in 1991, to move its capital back to Berlin from Bonn, the discussion about a suitable airport started.
But after the 2005 harvest, the worst in a decade, Bingu wa Mutharika, Malawi's newly elected president, decided to follow what the West practiced, not what it preached.
The plan is for about 15% of the cleared area to go back to forest, and half of the rest to be left to cattle-ranching and half to arable farming.In 2011 Simão Jatene, Pará's newly elected governor, decided to replicate Paragominas's achievements around the state.
