Will my existing case fit the new Raspberry Pi 5?
Probably not, if you want all access to the new ribbon ports and on/off button, you will need a case designed for the Raspberry Pi 5, such as the official Raspberry Pi Case which comes with a integrated variable speed fan.
On top of the new buttons and connectors the ethernet and USB ports have switched sides to where they were on the Raspberry Pi 3 Model B
Probably not, if you want all access to the new ribbon ports and on/off button, you will need a case designed for the Raspberry Pi 5, such as the official Raspberry Pi Case which comes with a integrated variable speed fan.
On top of the new buttons and connectors the ethernet and USB ports have switched sides to where they were on the Raspberry Pi 3 Model B