People are going to give you various answers, but let me just tell you the real answer:
Nobody knows.
The hacking scene in general is always evolving and new things are found all the time. You never know when a new hacker shows up, a new firmware update, or a new exploit is discovered. The fact of the matter is, there is virtually nothing available at this time on Wii U. When things are actually released, it COULD be several months before an exploit is found for 5.5.0, OR an exploit could be found before anything is released. If you're looking to be on the cutting edge and get everything the day or week it's released, you may be out of luck, but in hacking it's always just a matter of time.
Given that nothing is really available yet, I wouldn't worry about it. There's a pretty good chance more exploits will be found in the weeks and months to come.