Yesterday the Wii U browser exploit for the (almost) current version has been released:
As of now, 5.4.0 is the newest so do NOT update:
http://en-americas-support.nintendo.com/app/answers/detail/a_id/1436/~/system-menu-update-history
Note that so far this doesn't do much but in a few days the kernel exploit will most likely be released as well which enables game modding.
Remember:
Piracy is only possible with an iosu exploit which is in the works but basically no developer likes piracy so if you were looking forward to that, it might take a lot longer.
As of now, 5.4.0 is the newest so do NOT update:
http://en-americas-support.nintendo.com/app/answers/detail/a_id/1436/~/system-menu-update-history
Note that so far this doesn't do much but in a few days the kernel exploit will most likely be released as well which enables game modding.
Remember:
Piracy is only possible with an iosu exploit which is in the works but basically no developer likes piracy so if you were looking forward to that, it might take a lot longer.