I see that the widescreen option for wiiU is now forcing it to 4:3 if you don't enable the Wide option. (it was forced to widescreen on r257 and less).
Instead of keeping current aspect ratio, it's forcing it to 4:3 if the loader doesn't have the setting.
If you want, you can rebuilt nintendont by commenting this lines :
https://code.google.com/p/nintendon-t/source/browse/trunk/kernel/main.c?spec=svn258&r=258#258
line258 and 259.
Then It will use your current resolution.
If you want 4:3 -> run USBGX from HBC
if you want 16:9 -> run AspectFixer -> run USBGX from HBC
if you want 16:9 -> run USBGX from Forwarder
I can make an option for all games launched from USBGX on WiiU (not only Gamecube).
If I have time today, I'll make the option for nintendont, else it will be after Xmas as I'm leaving home today's night.
Edit:
I just see that r259 make nintendont reading games from DVD disc drive!
I hope it will not break current launching method, or else it will not work from USBGX until I fix it.
I'll test after my holidays. Sorry if it breaks things.
It seems it doesn't break the autoboot.