Four user videos up on Gametrailers show what looks like an avatar-based golf game for the Xbox 360.
From the footage it looks like the project is still under development. But with Xbox Live releasing Joy Ride - an avatar-based racing game - it's not out of the realm of possibility they'd do something like this, too.
The big question will be if this is a fun casual game without motion control, which is more than half the fun in something like Wii Sports.
We've emailed a Microsoft PR rep to see if they want to comment or swat this rumour. If we hear anything we'll let you know.