This is the scenario:
1) I set up a personal hotspot using my iPhone 4S running iOS 5 (we call this device A)
2) I connect a mobile device (e.g. a smartphone) using WiFi to have it use the hotspot for internet (we call this device B)
Is it then possible for outsiders to sniff information about device B, e.g. the IMEI/MAC address, if internet traffic over the hotspot is monitored?