Architecturally, OBIEE 12c is - on the surface - pretty similar to OBIEE 11g. Sure, we’ve lost OPMN in favour of Node Manager, but all the old favourites are there - WebLogic Servers, BI Server (nqsserver / OBIS), Presentation Services (sawserver / OBIPS), and so on. But, scratch beneath the surface, or have a gander at slide decks such as this one from BIWA this year, and you realise that change is afoot.