Mobile analytics firm Flurry says it's already tracking more than 200 apps being used by 50 tablet devices on Apple's Cupertino campus.
The company has been able to measure the activity because its technology is being used to provide analytics for the apps.
"Because Flurry could reliably 'place' these devices geographically on Apple's Cupertino campus, we have a fair level of confidence that we are observing a group of pre-release tablets in testing," the company claims.
Develop reported in August last year that Apple was working on a tablet device that would run as a game platform.
The company is expected to unveil the device on Jan 27 at a special press event.