Apparently there are now 3 authors for the FR in terms of novels. One is Salvatore, One is Greenwood.. am not sure who the 3rd novel writer is.
In regards to a campaign setting book for FR, no news. There has been a 'none will be made' a 'we are thinking about it' and assorted other posts.
The only FR information you will get at the moment is stuff out of either Hoard of the Dragon queen, Rise of Tiamat and the soon to be released Princes of the apocalypse. If you want more , you will need to either play in some Adv League Expeditions scenarios which are currently all set in Phlan (ie the Moonsea region). Next season they are mostly all set In Mulmaster.
Each of these scenarios adds a bit more FR lore.