The controversial Rainbow Six Patriots, a project that first broke cover some three years ago, is no more, with an all-new series entry called Rainbow Six Siege taking its place within Ubisoft Montreal.

Development on the new project started 18 months ago, with a focus being placed on asymmetrical multiplayer. The core concept sees two teams of five facing off against each other in a quick succession of six three-minute matches, with each taking turns to play as the attacking and defending teams.

As the attacking team, players look to breach rooms and take down opposing players, with the quick-fire nature of the game meaning there are no respawns.

As the defending team, players have to fortify rooms and set up traps for their opponents. Unifying the two teams is a procedural destruction system in which you can breach any door, wall or window. It's all being built within Ubisoft's Anvil engine for Xbox One, PlayStation 4 and PC, with a release loosely scheduled for 2015.

Although the focus is on the multiplayer right now, Ubisoft Montreal says it will take those systems and build them out for a single-player experience, and Rainbox Six Siege will be a full-priced release.

Rainbow Six Patriots had a rocky time in its development, briefly emerging late in 2011 with a controversial take on extremism in the United States.

A gameplay video is below.