There is speculation that many of the charges are related to falsifying business records to cover up the payment, which would explain the number of charges involved. If true, then this case has parallels with what happened with Bill Clinton in the Monica Lewinski case: it wasn't the affair that was criminal act, it was the coverup after the fact.
Based on one article that quoted an anonymous source from one of Trump's advisors or confidants, said that they are working toward an arraignment on Tuesday. But it's a high profile case with exceptional circumstances--namely the involvement of the Secret Service--so we should probably take that date with a grain of salt.