Someone correct me if I am wrong...but the reason the Argonians/khajits were the way they were in Morrowind is because they were like a different subspecies of Argonian/khajit(which is why they were often caught and taken as slaves) as compared to the more civilized ones we find in Oblivion. Least I remember reading something like that in the lore section.
I imagine they will be the same style from Oblivion but obviously look better.
In Morrowind Argonian and Khajiit was not planned to be playable races, but mostly slaves. This become very unpopular so they changed it, one leftover was that the beast races could not wear boots because they had non standard legs.
I personally love the digitigrade legs, and would happily drop boots for them. However lots of people will complain and I also guess that animation might be a issue this depend on how the legs are animated.
Prefer Khajiit over Argonian but the they has the same issue and will have the same features.