I have just tried to connect to my guest network.
Setting the wifi from the interface, here is what appears in journalctl.
Sorry for the photo quality.
After, the raspberry pi freezed, and crashed.
After reboot, i noticed the netctl profile is well created in /etc/netctl.
I need to remove it to have internet connection.
Note, my AP uses channel 13, i'm FR.
And the AP is not visible from iwlist, even if i updated the wireless-regdb package and /etc/conf.d/wireless-regdom file.