I was just in a chat on the apple store and they claim the ram is the same from before. 2 GB in 10.5 and 4 in the 12.9. Do we believe or not is the question.
I was transferred to a specialist.....but again, probably not correct. I wouldn't be surprised though.
Just For future reference, Apple customer service representatives know very little about technical hardware aspects or as much as the consumer knows about any future product releases or recent hardware launches. They barely have insight even the day of the launch or information as much as you would know after the keynote. They don't even have exact specifications other than what we can see publicly on Apple's website, more specifically, they don't have much knowledge of when it comes to Ram, benchmark performances, etc.