Dual camera sounds exciting! However, due to limited space, there is not enough room for an extra camera. [list]
For small display, there is an LCD connector on the HAT, however not Grove connector. Actually, there is no suitable Grove LCD as capable as the one that MXchip board uses. [list]
Maybe can add an RGB LED show status for Cameras and sensors.
BTW, there is a section opened just for this Grove AI HAT, there are already many discussion about the HAT, may we continue our discussion there?