I guess I should have clarified or not misspoke in the sense of what the engine can do.
To clarify. Gameworks does work with the engine. This means that Hairworks and the other features of it can be used with the engine. However, these plugins are not included with the engine. The only ones that are are Apex Cloth and Destrucibles. The goal here is for Epic to provide the same user experience to a broad a user base as possible. Having all of gameworks integrated into the engine and using the GPU would mean that those using ATI cards would not be able to use these features.