I found this while searching and personally I dont watch this sort of stuff, but there is a lot of you who do.
The packer has made a great job with this, and well here’s a very brief outline on it. magic 
More of the Island’s secrets will be revealed as the castaways continue to seek rescue after making contact with a freighter.
Season 4 will feature both flashforwards and flashbacks.
Production began on August 17, but halted in late November due to the writers’ strike.
As a result, the current plans are to air the first eight episodes of a shortened season.