Technically we have had a run of a dungeon before, with the Christmas event dungeon, it may not be exactly the same as the final products who knows, but it existed. Either way making suggestions on future content isn't bad.
As for the OP, yes there will be more updates, and others have said one fairly soon, that will introduce the Unova region and its pokemon/moves. There will be a Public Test of the new content in a few days as well as some more information of whats to come.
You can also discuss it with other players, and potentially the devs/staff team that dip into the topic here: