@Federico - I guess the NM problem is the naming issue patched with this one ...

broadcom-sta-5.100.82.112-eth-to-wlan.patch (text/plain), 343 bytes, created by Ulenrich on 2012-10-18 23:49:29 UTC

--- src/wl/sys/wl_linux.c.orig	2012-10-15 19:48:52.039559099 +0200
+++ src/wl/sys/wl_linux.c	2012-10-15 19:51:13.511700569 +0200
@@ -260,7 +260,7 @@
 #define quote_str(s) to_str(s)
 
 #ifndef BRCM_WLAN_IFNAME
-#define BRCM_WLAN_IFNAME eth%d
+#define BRCM_WLAN_IFNAME wlan%d
 #endif
 
 static char name[IFNAMSIZ] = quote_str(BRCM_WLAN_IFNAME);