The dates are usually based on projections from the programmers. With each update pushed by the IRS the programmers have to code the new forms and then test everything to see that it works before they roll it out to the public. In this instance I would guess that they said "New IRS update - it'll take us 48 hours to get it ready and make sure it works."
And this time of year they definitely work on weekends.
@MikeEII
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