We have verified that the new app works great on an older iPodTouch (MC008LL, IIRC 3rd gen), under iOS 5.1.1, on which we entered the camera's WAN addresses.
It seems that, at least on our iPad2, having already entered the connection data for the cameras' LAN addresses, the app will not permit adding the WAN addresses as well. Perhaps this is intentional so as not to call the same camera twice.
But OTOH we can use both devices at the same time, with the small one getting the WAN path to the cameras and the larger connecting to the LAN.
It would be nice if BOTH paths could be entered on either device, with a checkbox to enable or disable - thus when traveling, would not have to reprogram the device to WAN, yet at home could simply connect via the LAN.