It's pretty obvious to me, that future facelift Macan TT will NOT get V8.
Future facelift Macan TT will get new 2017 Panameras 4s engine 2.9L turbo V6, which currently is tuned in to 440 hp/ 405 lbft in 2017 Panamera 4s. The same engine will go into future facelift Cayenne S, Cayenne GTS.
The new "small" V8 4.0L (vs previous generations V8 4.8L) will obviously go into future facelift Cayenne TT. This "small" V8 4.0L currently is tuned to 550hp/ 567 lbft in 2017 Panamera TT.
The only question is left, what "garbage" they will decide to put into future facelift Macan S, Macan GTS engine bay. I expect these particular models WILL suffer. In the past, they really screwed up and "downgraded engine wise" prev. gen. 2014 Panamera 4s/GTS, 2015 Cayenne S/ GTS from V8 4.8L into V6 3.6 turbo. The same tendency they continued in Boxster from V6 into V4 turbo.
They fool you by encreasing a little max hp figure in turbo version of a SMALLER engine (V6 turbo vs normal V8 or in Boxster the same a little higher max hp figure for V4 turbo vs normal V6).
Very few folks really understand, that V6 even with BIG turbo, producing more MAX hp (for example, in 2015 Cayenne S, than previous <2015 generation V8 4.8L Cayenne S) in REAL life slow speed driving range 60-120 km/h with ocasional bursts of more speed is utilizing mostly V6 in the mode WITHOUT turbos. You are driving 2015 Cayenne S in a V6 "without much turbo involvement" mode most of the time in real life scenarios of not high speeds...and V6 has LESS power reserve "on demand available", than normal V8 even with a little less MAX hp figure. For turbos really to come to life you need to speed a little MORE and a little LONGER.
..they still fool you by selling a weaker power band engine, which they call more efficient/fine tuned/economical for a MUCH higher price...very soon they will reach motobike engine levels V2+big turbo or V1+even BIGGER turbo...