An update from the MAP website's Mission Status section:

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Feb. 2003
First Data Release, Feb. 6, 1 pm EST.
NASA Headquarters.
A NASA Space Science Update press conference will release the initial
findings of the full sky survey. The data will be archived and
distributed via NASA's new Legacy Archive for Microwave Background
Data Analysis (LAMBDA) -- a data center focused on cosmic microwave
background research. LAMDBA is currently under construction and will
be launched with the first MAP data release.
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It appears that the original "late January 2003" release has been pushed back slightly. Also note that February 6, 2003 falls on a Thursday. If what I suspect is true, then a press conference on that day would be consistent with publication in the journal Science, which normally lifts its embargo on papers to be published in the next day's issue.