Warcraft News plugin provides a widget to display guild or character news from the new battle.net armory. You can add as many widgets as you want, e.g. one guild and three char news widgeds. It also can optionally include the wowhead javascript and replace the blizzard item links with links to wowhead with nice tooltips.
This addon (currently) does not show a guild roster.
Download and info: http://wordpress.org/extend/plugins/warcraft-news/