Mon Aug 22, 2016 3:24 pm
IF you have the system working on a Pi3B it *should* work on a Pi Zero. You will probably need an OTG adapter for a USB attached camera. Depending on what else you are planning to connect, you may need a USB hub as well.
If you want to use two RPF cameras, then your best bet is to get Compute Module (CM) which exposes both CSI interfaces (and both DSI interfaces as well). The dev kit carrier board has both (of each) CSI and DSI connectors.
Note, though, that the Pi3B is about 10 times faster than the Pi Zero and has twice the memory so the Pi Zero may or may not be able to handle the demands of two cameras, depending on what you are expecting to do with them. If that turns out to be a problem, continue your prototype work and--for cost. space and power issues--wait for the Pi3A to be released.