I went back and looked at the data, and UC4 will definitely break the 1 million barrier in the U.S.
Here's the data on Uncharted 1 to 3's opening month in the NPD:
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UNCHARTED 1: DRAKE'S FORTUNE [11/2007]: 117k
UNCHARTED 2: AMONG THIEVES [10/2009]: 537k @ #1
UNCHARTED 3: DRAKE'S DECEPTION [11/2011]: 700k @ #7
TLOU on PS3 opened to much higher numbers, likely due to it's critical acclaim and ND's name but it was still a brand new IP (which never pull numbers higher then established IPs typically):
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LAST OF US, THE [06/2013]: 985k @ #1
In contrast, Infamous: Second Son pulled pretty respectable numbers a few months after PS4's launch despite it being non-numbered title in a series that has never been considered one of the big Sony IPs.
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INFAMOUS: SECOND SON [03/2014]: <500k @ #2
UC4 will releasing in March, on the dominant console (in the NPD) and will likely follow the upward trajectory of UC sales. The critical acclaim of TLOU is also likely to help the title. Other then as a result of being a failure critically, anything less then a 1 million would honestly surprise me as a result.