We already know it's all-but-certain Lady Antebellum's sophomore album "Need You Now" is headed for a No. 1 debut next week on the Billboard 200 chart, but now it's looking like the album is going to sell more than originally expected.

Way more.

This past Tuesday (Jan. 26), on the day of the album's release, industry sources thought the country trio's set would move around 325,000 by the end of the tracking week on Sunday, Jan. 31. By Wednesday afternoon, that forecast grew to at least 350,000. And now? Well, folks think the Capitol Nashville album could sell as much as 425,000 copies in its first week.

Just how huge is that number? The last time a country album debuted with at least 400,000 was way back in November 2008, when Taylor Swift's "Fearless" opened at No. 1 on the Billboard with 592,000 copies. And lately, it's rare to see an album start with more than 400,000, regardless of genre. In 2009, only six albums debuted with more than 400,000 copies in their first week.

Lady A's sale projections are from industry sources based on internal data. The true, final Nielsen SoundScan numbers, as reflected in the Billboard 200 album chart, won't be released until Wednesday, Feb. 3.

Other albums headed for likely high debuts on next week's Billboard 200 include Corinne Bailey Rae' "The Sea," Celtic Woman's "Songs From the Heart," Barry Manilow's "The Greatest Love Songs of All Time" and Never Shout Never's "What Is Love?"