Compatibility with the Arduino Motor Shield REV3 ?

How can I know if the new Arduino REV4 wifi board will be compatible with the Arduino Motor Shield REV3 ?
I had same problems by using clone of Arduino, so I used the Arduino shield REV2 wifi and I d like to know if the Rev4 is compatible with it ?

Arduino Motor Shield is compatiable with Arduino UNO R4 boards.
Check " Can I use hardware compatible with the Arduino UNO R3 with the Arduino UNO R4 WiFi?" section of Arduino® UNO R4 WiFi