At this point we still don't know much about how Twilight Princess HD will differ from the original game, but today a few details have come to light. Earlier today we found out about a change in the tears of light quest, now thanks to a new screenshot another new detail has been revealed.
The newest screenshot that you can see above reveals a wallet limit of 2000 rupees, noteworthy is the fact that this image is taken at the full end given the full set of heart containers. Originally you were only able to collect up to 1000 rupees so this means we now have a new limit and perhaps a new wallet or even a complete extension. It remains to be seen how this will work within the game but on a positive side it will make completing a specific sidequest easier.