This video here shows the new double rotation Mechanism implemented in the A series. The rear cameras will be used for the front camera as well. Check the video to know more.https://youtu.be/MIxaERdaJNw
According to the new leaks Galaxy Note10 could also have 2 variants i.e., the Note10 and Note10e like the S10e with a 6.44 inch display. The display on Note 10 is going to be 6.75 inch with 4 rear cameras.