'What do the words mean? Nothing. The Dirge of Eir Glanfath is sound without form, a lone voice crying out in mourning because it must.'
This enigmatic statement, accompanied by the '4' logo above, appears when you access Obsidian Entertainment's website. It's a tease for a new project, currently only known as Project X, the nature of which is being fiercely debated by fans on the official forums.
Considering the fantasy connotations of "Eir Glanfath" and the number 4, the smart money is on Obsidian developing another Dungeon Siege title. They delivered the "solid-yet-unspectacular' Dungeon Siege III last year, but you're more than welcome to hedge your bets.