According to Billboard, The Marshall Mathers LP 2 is on the path to debuting at number 1 and selling between 700,000 and 750,000 copies in it's first week. If this does indeed happen, it'll put Em behind Justin Timberlake for the biggest sales week of 2013 (JT's The 20/20 Experience sold 968,000 copies in it's first week back in March).
The final numbers will be released on November 13th, so we'll have to wait until then to see how many album the legendary MC has sold.