Microsoft's applied for a trademark on 'Eden Falls', a property classified for "Entertainment services, namely, providing an on-line computer game".
The application was filed on April 16 and spotted by NeoGAF usere Koutoru. Microsoft has made no announcements surrounding the title, though an empty Twitter account for @EdenFallsGame indicates it belongs to Microsoft-owned studio Lift London.
Lift London states on its website that it crafts "games for tablets, smartphones and beyond."
"We've a number of titles that will be launching soon - but it's all a bit hush-hush for now. So pop back to see how our story develops."
The patent application joins several other seemingly unannounced projects for Microsoft: an application for 'Screamride' is also identifed as "entertainment services, namely, providing an online computer game", and 'Snap Attack' and 'Secrets of Treasure' have similary surfaced on US Patent & Trademark Office records.
Microsoft has said that it "often acquires various trademarks as part of its ongoing business strategy, but beyond that we have no comment".
In late March, shortly before Phil Spencer was promoted to head of Xbox, the executive said Microsoft's E3 2014 press conference will feature "very few execs" and is already overstuffed with game-related announcements.