This is an excerpt from an Audi MediaCentre release 14/3/19 with relevance to WLTP:-
"In the first months of this year, Audi is successively closing the remaining gaps in its product offering from the changeover to WLTP and is creating the conditions for a positive sales development. In the course of the year, inventories that had been ramped up in 2018 for supply management during the transition to WLTP will be reduced. For example, Audi had already gradually restarted the production of engine-transmission variants for which the company expected type approval in the near future, in order to ensure rapid availability for customers following official approvals. Once the required homologations have been received, these pre-specified vehicles will gradually flow out of inventories. In addition, the company is making intensive preparations for the next, equally demanding, stage of the WLTP test cycle, which will come into force on September 1, 2019 with even stricter legal requirements for all vehicles. Audi has increased its technical test-bench capacities by around a third in order to make implementation more manageable, and has added approximately 300 employees in Technical Development for homologation and powertrain development. The company has reduced its portfolio of engine-transmission variants by about 30 percent in line with market preferences, thus noticeably reducing complexity as a first step."