Eminem's new shit "Number one" is so called "breaking bottles".

On Friday, an unfinished Eminem and Dr. Dre track labeled "Number One" hit the Internet. The leaked song is going to be featured on Big Mike and Neptune's upcoming 4th Quarter Pressure Part 2. The track finds Em apparently referencing rhymes for Dr. Dre. According to a source close to the Shady/Aftermath camps, the record was never meant to make it off the cutting-room floor, and it's not currently scheduled to be on either Eminem's Relapse or Dr. Dre's Detox. We also found out that the official title for the record is "Breaking Bottles."
Both Relapse and Detox are due sometime in 2009. Before I Self Destruct is slated for February 4

Source:
http://www.mtv.com/news/articles/1600904/20081208/eminem.jhtml