So here's an interesting quote from Nether-Prince Durzaan referring to the Telogrus Rift: 'Even shattered as it is, this place echoes with the whispers of the great ones [the Old Gods?] who were slain... and the hatred of he [Sargeras?] who broke this world.'
We saw Sargeras destroy an Old God-infested World Soul during the Chronicles Volume 1. Is the Telogrus Rift all that remains of that corrupted World Soul?
I think that Telogrus is not just some broken planet within the Twisting Nether; i am quite fascinated by its dark past, and of its possible relationship with Sargeras/Old Gods. I hope Blizzard will expand upon this.