Personally, even though it's likely gonna be some sort of pallette swap to make it easier for them, I'm hoping for these costumes as the classic ones for Sub and Scorp:
Sub-Zero:
Even though the younger Sub-Zero debuted in MK2, I think most of us noticed it was a different one(from a visual standpoint) when using his MK3 outfit much more significantly. I still really like this design, and I am wondering why they haven't taken the unmasked approach as an alternate optional costume since MK

A. Since they have done a good job at making each ninja like character look different and stand out from one another beyond just color schemes, this outfit was the first to truly do that. So I wonder why they completely abondoned it...I love me some masked Sub-Zero, but an unmasked with the scar would definitely make me happy as an option. So hopefully if it's not the classic costume, it's used in the game as an alternate outfit as it would play into the MK1-3 theme well.
Scorpion:
For Scorpion it's a tough call because his look has varied greatly to a certain degree over the years. Even though the classic quilted pattern I find suites him very well, I still think this design screams Scorpion the most. Likely because he's the only one to use it after MK4, as Reptile, Ermac, Noob, and Rain all got new unique designs. So i'd like this to be his classic outfit, but I wouldn't be disappointed if it was just a pallette swap because it would still fit him well. Though for the actual in-game alternate attire, I am hoping for a flaming skull approach.