DC has informed retailers that Crisis on Infinite Earths Giant #1 has been pushed back four weeks to a new January 15, 2020 release date. It was originally solicited for a December 18 release.
The publisher didn't specify a reason for the change, no give any further clues as to what the issue would contain besides the previously-announced "24 pages of new stories plus classic reprints!"
A second issue is solicited to come out just one week later on January 22.
Here is the updated solicitation:
CRISIS ON INFINITE EARTHS GIANT #1
Includes 24 pages of new stories plus classic reprints!
ON SALE 01.15.20
$4.99 US | FC | 96 PAGES | DC