According to rumour, both will be released in 2026.

That's an exciting prospect!
Based on the most recent information, the release dates for both films have been moved:
 
Shrek 5 was initially set for 2026, but the current reported release date is June 30, 2027.
 
Ice Age 6 (titled Ice Age: Boiling Point) was also initially rumored for 2026, but the latest scheduled theatrical release date is February 5, 2027.