Game company Ubisoft has officially announced on their blog that the release of "Tom Clancy's Rainbow Six Siege" has been moved to Dec. 1 as the development team is working on adjustments and improvements on the game. This delay applies for all regions. The game's original release was slated for Oct. 13. 

According to the official blog post, improvements will be made to the game's co-op on all game modes, as well as weapon and gadget balancing. There will also be additional changes to the menu and interface navigation. Ubisoft also notes that they are taking their time on these improvements to "deliver the best game possible."

However, the closed beta for "Rainbow Six Siege" will still be launched on Sept. 24 as planned. Ubisoft explains that the extended period for the beta — now that the game's official launch is moved to December — will allow the development team to further test and improve the game's infrastructure and matchmaking system. 

It is unclear at this point just how much the development team intends on changing or altering the game prior to its release but given how it was considered "ready" for its former October release date, it might not require that much tinkering and will roll out before the end of the year as scheduled. 

Ubisoft addresses that the decision to delay the game comes from feedback through the game's alpha testing phase and hands-on demos during the Electronic Entertainment Expo and Gamescom events.

"We understand that many of you are excited to get your hands on the final game, but as gamers ourselves we know that quality comes first and we are committed to delivering the best game possible. We couldn't make the game without you," reads their announcement. 

"Tom Clancy's Rainbow Six Siege," which began development in January 2013, is considered by fans as a revival of the series as well as a successor to the now-cancelled "Tom Clancy's Rainbow Six: Patriots." It is also the first title since "Rogue Spear" to not use the Unreal Engine system as it instead relies on Ubisoft's own AnvilNext game engine. 

The game will be available for PC, PlayStation 4 and Xbox One.