An evolution of the three previous scenarios that provides multiple options for the various technologies. Data may be harmonized and analyzed in the data lake or moved out to a EDW when more quality and performance is needed, or when users simply want control. ELT is usually used instead of ETL (see Difference between ETL and ELT). The goal of this scenario is to support any future data needs no matter what the variety, volume, or velocity of the data.
Hub-and-spoke should be your ultimate goal. See Why use a data lake? for more details on the various tools and technologies that can be used for the modern data warehouse.
Check it out for a high-level architectural view of contemporary warehousing choices. I prefer having both systems in play: the EDW answers known business questions and gives you back report information relatively quickly; whereas the Hadoop cluster allows you to do spelunking, data cleansing, and answer unanticipated business questions.