Interesting that I didn't see this until I started poking around: Everything we know about the Audi Q6 e-tron in August 2021 (topelectricsuv.com)
So from that article is does appear that for the 'lower end' Audi's that align roughly with the current 'entry cars' (Q3, A3, and A4) will all be built on some version of MEB. Where everything starting with equivalence to the A6/Q5 and up will most likely be built on PPE. And I'm guessing that means VW's will almost all be built on MEB. Not sure where the current A5 goes.
Audi seems to be replacing all the ICE cars with new numbers that are one higher, so evens for electric and odds for ICE. If that holds, at least for Audi SUVs:
- Q3 -> Q4 subcompact range - which explains a lot in terms of the choices Audi is making for the Q4, because it does FEEL to me like a slightly upscale Q3 just with more space
- Q5 -> Q6 compact range - coming sometime next year
- Q7 -> midsize range all new electric Q8 which collapses the ICE Q8 and the Etron into one offering
No VW brand currently offers a full size SUV, and not sure I see them doing that either. The VW Atlas sort of spreads out to be a bit bigger than the Q7, but it's still considered a mid-sized SUV.
Also interesting to note from that article that the Q6 infotainment will be built on Android Auto (a custom Audi build from ASOP vs a Google provided build at that), dropping the current in-house built tech stack in the current cars (and being put in the Q4 as well). So clearly the Q5 will be what Audi is putting up against the Tesla Model Y, still more than a year from now.
The question will be where the price sits, as everything Audi is moving upmarket by about $10k it seems in the transition to electric. So a Q5 would presumably start in today's market around $55k, just like the Q4 is about $10k more than the Q3. At that starting price, they clip into the Model Y performance and the Audi is likely to go up another $10k in options if past holds true. They will have a fight on their hands more so than any current MEB car vs the Model Y. If it starts at $70k at the article implies, it's dead before it even gets here I think.
EDIT: Oh, and watching the little sizzle reel on the PPE platform, it still doesn't look like it will have room for a frunk. Sorry Sandy.