Yes.
Any "chatter" is just speculation on some peoples' part as to what DL would do. The only change to the MQM levels will be the addition of the 4th Tier.
From DL.com's MQM membership guide.
Members will earn 2010 status based on Medallion Qualification Miles (MQMs). MQMs are points used as a counter to determine SkyMiles® Medallion status. MQMs can be earned through flight activity or SkyMiles partner activity. 2010 Medallion status can also be earned through the total number of segments flown. All paid fare classes eligible to earn MQMs count towards Medallion Qualification Segments (MQSs):
• 25,000 MQMs or 30 MQSs achieves Silver Medallion status
• 50,000 MQMs or 60 MQSs achieves Gold Medallion status
• 75,000 MQMs or 100 MQSs achieves Platinum Medallion status
http://www.delta.com/skymiles/about_...ance/index.jsp