async def nextUp(self, userId=None):
json = await self.connector.getJson('<STR_LIT>',<EOL>pass_uid=True,<EOL>remote=False,<EOL>userId=userId<EOL>)<EOL>return await self.process(json)<EOL>
returns list of items marked as `next up`

        |coro|

        Parameters
        ----------
        userId : str
          if provided, then the list returned is
          the one that that use will see.

        Returns
        -------
        list
          the itmes that will appear as next up
          (for user if id was given)