I had just same problems using an Atheros card (ath5k). Problem seems to be that connman doesn't find wlan0 ...
I disabled connman and configured wpa-supplicant and interfaces. This works ... but cannot be the solution.
Starting with 0.9.0 of the sd-card-image you can use opkg (like apt-get). Alex T. from Intel set up a server for that.
Please search the forum! After configuration of opkg you can install connman-client, connman-tools and connman-test ...
This should help finding the problem.
regards balou