Could ODST break Halo 3's opening record?

[Slimebeast]

Remember that ODST is labeled as Halo 3 with an undertitle. It's like an expansion pack, not a sequel.

Halo 3 sold 3.8 mill in it's opening week. Halo Wars sold just 600,000 copies in it's opening week.

I think Halo 3 ODST will land somewhere in between. 1.8 million first week.