Much like that RPG Panel that never was, Microsoft were supposed to give a 45-minute demo of Fable 2. If it actually happened, it certainly hasn’t materialised yet.

From IGN:

On Tuesday, March 6, Microsoft’s Developer Conference Suite will feature a handful of 45-minute demos of this year’s pre-eminent role-playing games from BioWare’s Mass Effect and Lionhead’s Fable 2 to Mistwalker’s Blue Dragon.

Via Portarock.

Update: this seems to have happened, but in the form of 30-minute demos  to journalists only. The videos of this are here.