Tax fraud on the scale alleged is going to court. There are no two ways about that.
Through those proceedings, a lot more information about Wright will eventually become public. Typically, though, such proceedings take years.
Whether or not Wright is Satoshi is irrelevant to the tax case but the tax case may ultimately reveal the answer to whether or nor Wright was involved in the early development of Bitcoin.
It will be interesting to see where the seized evidence leads. Wright is interesting not for the possibility that he may be Satoshi, but because this could be the first Australian case of substantial tax evasion, money laundering, and fraud in which Bitcoin is central rather than incidental.