I wonder how close are we to a newly redesigned MBP 13" and 15", my guess is it's either WWDC they'll unveil new laptops or within a 1 year timeframe.
This is what I guess the new MBPs will be
1. Same amount of ports as current retinas
2. Probably thinner as they'll likely further shrink the logic board
3. Butterfly keyboard mechanism but retains the key travel of current rMBP keyboard
4. Externally, it'll look a lot like the current rMBP (taking some design cues from the new MacBook, with all aluminium enclosure, speaker grille on the top of the keyboard, thinner on the sides so they can market the new MacBookPros as more compact then previous generations)
5. Internally, everything will be soldered and glued, so include the ACPP into your purchase total cost as if something gets broken, it'll be an expensive fix.