The sky's the limit of what kind of revision it could be. It could merely add more storage and a few other tweaks. Or it could upgrade the hardware a significant amount. Awaiting details from Nintendo.
Lifetime Sales Predictions
PS4: 122 mil (was 100 million) Xbox One: 55 mil (was 50 mil) Switch: 79 million
3DS: 77 mil (was 73 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima