I checked the project settings rendering settings and don’t see the MSAA option anymore in the Unreal Engine Preview 1, was it moved to another location?
I’ve entered a ticket for this. For your reference the ticket # is UE-6968.
Once there are any updates to the report I will update here. This may also be a deliberate change, if so I will pass along any information I am given.
The developer has come back and said this was a deliberate change. This setting has now been tied into the engine scalability settings. It is also noted that having the MSAA directly settable in the settings would make the scalability settings much more complicated.