EcoBoost has a big problem ahead !
First, understand that this was a Bosch "thing", pushed by FoE. Half way through the development (I was working in R&E at the time) of the engine for the 2010 Taurus SHO, Ford NA could not duplicate the fuel economy improvements Bosch had promised to management. That was because the big improvements were only seen on the Europen drive cycle, not the US drive cycle ! The program went ahead anyway, and as everyone knows it has been a big success. (The Gen 1 EcoBoost on the old 3.5L Taurus was almost exclusively Bosch components and software. When the US 2.0L EcoBoost came out, Bosch had few if any components on the engine and the software was almost 100% US written.)
There are upcoming changes in US emission days that will limit particulate emissions from gasoline engine. Direct injection produce more particulates than port injection (something Ford has known, but probably forgotten, since they developed the PROCO engine back in the 70s-80s). Some of the EcoBoost engines now have 2 sets of injectors, one direct, one port. I do not know the exact "strategy" used to decide which ones are used (or what percentage of fuel is injected through which ones), but it does get them past having to use a "particulate trap" like on diesels !