If you read the press releases, the IRS announcement that it will not accept tax filings until February 11 for people with complicated returns. From my experience helping a friend, I suspect just about everyone is impacted by the delay.
My friend’s return was extremely simple with the standard deductions and education credits. With the exception of the eductation credits, he could have filed a 1040 EZ return.
If his got rejected, just about everyone's will be.