From IDG World Expo’s statement, as published by Macworld:

We are announcing today that Macworld/iWorld is going on hiatus, and will not be taking place as planned in 2015. Our MacIT event, the world’s premiere event for deploying Apple in the enterprise, will continue next year with details to be announced in the coming weeks.

I would guess that by “on hiatus” they mean “over.”

The writing’s been on the wall since Apple announced their last year at Macworld Expo in 2009. Everyone knew that this would happen eventually — I’m surprised that they’ve made it this long.