Spec Ops: The Line's demo is available now on Xbox 360 for Gold subscribers and later today, following the PSN update, on PlayStation 3. It will be available to all Xbox Live members on May 15.
The sampler will feature a snippet of the single-player campaign, covering two early chapters in the game, as players search for a target through the sand-ravaged streets of Dubai and add more destruction. You'll have plenty of time to play the demo and practice, Spec Ops: The Line won't storm retail shelves until June 26.
Update: Removed mention of multiplayer as being part of demo. It's not.