Serious Sam HD: The Second Encounter was released today, with a great Multiplayer Trailer. New fanart:

There are new pictures and fanarts.

You can pre-order Serious Sam HD: The Second Encounter on Steam. If you pre-order now you will get a 10% discount as well as an Ugh Zan III multiplayer character.

You can watch the trailer here. New screenshots:

You can pre-order Serious Sam HD: The Second Encounter on april 8 according to Devolver Digital

There are five new SSHD:TSE pictures on Serious Sam Facebook page, and the demo version is coming soon according to Devolver Digital.

There is a new patch for Serious Sam HD: The First Encounter, with brand new deathmatch mode, 7 new deathmatch maps, spectator mode, and of course new achievements.
(The game is updated automatically by the Steam client)

Serious Sam HD: The Second Encounter comes on late april according to Big Download

You can download Serious Sam Forever multiplayer demo from the official website.
(WARNING! Serious Sam Forever is a mod, so you need to install the original Serious Sam 2 and you need the newest patch too)

Here comes some information about Serious Sam 3.
And did you know, that the HD remake take a lot of work for Croteam?
And Serious Sam is not simplistic.