At the moment, the only way to change the news and weather settings is through the dconf-editor (sudo apt-get install dconf-editor to install). In dconf-editor, navigate to org → pantheon → gazette.
To change the weather, visit weather.yahoo.com, and search for your location. Find your specific location ID number in the URL and paste in that number. To install:
sudo add-apt-repository ppa:gotwig/weekly
sudo apt-get update
sudo apt-get install gazette
sudo apt-get update
sudo apt-get install gazette