The serious Sam series has always been about over the top, glorified boyhood fantasy violence and Serious Sam 3: BFE intends to bring that same formula by with more modern technology and features.
The official website describes Serious Same 3 as:
Serious Sam 3: BFE is a glorious throwback to the golden age of first-person shooters where men were men, cover was for amateurs and pulling the trigger made things go boom. Serving as a prequel to the original indie sensation, Serious Sam: The First Encounter, Serious Sam 3 takes place during the Earth’s final struggle against Mental’s invading legions of beasts and mercenaries. Set against the collapsing temples of an ancient civilization and the crumbling cities of 22nd century Egypt, Serious Sam 3 is an exhilarating fusion of classic twitch shooters and modern gameplay features.
To whet your appetite we have the first two episodes of the Help Line videos.
Serious Sam: BFE is due for release October 18th this year.