According to a revelation by Microsoft Japan, two previously PS3-exclusive titles will be making their way over to the Xbox 360. Two games by Koei - Bladestorm: The Hundred Years War and Fatal Inertia - has gone multi-platform, following on the footsteps of titles such as Assassin’s Creed.

Fatal Inertia, in development at Koei Canada, is a futuristic high-speed racer which was initially pegged as a PS3 launch title. Omega Force, the studio behind the Dynasty Warriors series, is working on Bladestorm which was also thought to be a launch title.

The Tokyo Game Show this year saw Epic’s Tim Sweeney speak on various topics including the challenges of multi-core processors and PS3’s Cell processor, as well as some new details on Unreal Tournament 2007 for the aforementioned console.

Sweeney talked specifically about the difficulties of programming for multi-core processors, saying that it takes “about twice the effort and development cost” for these processors when compared to a single-threaded one. IBM, Sony and Toshiba’s custom-developed Cell processor is no different: the PS3 Cell chip “required about 5 times as much cost and development time than single-core.” He also said that the complex Cell architecture “introduces some economic difficulty for developers.” The Xbox 360 processor wasn’t part of the discussion.

However, he was full of praise for Sony when it came to the company’s open network scheme for the PS3’s online service. “Enlightened business model” were the exact words he used to describe the console’s online capabilities, as opposed to Microsoft’s closed platform Xbox Live which seems to be “quite negative toward user-created content” as the company has encountered.

Having praised PS3’s online network, he then proceeded to mention that users will be able to create Unreal Tournament 2007 levels and mods on the PC and play them on the PS3. After noting that the mod community was an “essential part” of the company’s success, he said that the company would love to transfer this mod community over to consoles, letting modders and mappers create content on their computers and then have them distributed online, as well as on the PS3.

As for Unreal Tournament 2007’s release date? Epic’s Jay Wilbur disclosed that they plan on shipping the game to PC and PS3 in Q2 or early Q3 2007.

In related news, Kotaku reports that Koei’s Fatal Inertia, initially pegged as a launch title for the PS3, has been delayed to Winter 2006. The company cites problems with the Unreal Engine 3, though they do mention that they being helped by both Sony and Epic on this. When asked about multiplayer by the site’s editor, the game’s producer said that he was “dreading this question,” as they’ve been having issues with their middleware platform. As noted by Kotaku, it seems that multiplayer is planned, but not set on stone yet.

The report also discloses that both Fatal Inertia and i, the company’s new PS3 title, will be in 720p, with the former making use of the console’s tilt controller. Koei also indicated that they are in discussions with Microsoft to bring over the titles to Xbox 360.