I definitely believe they will upgrade the battery again. Could be the new 120Ah Samsung cells (most likely) because they are the same physical size as the 60Ah and 94Ah and this isn't the 2nd generation i3, just an LCI refresh.
I also expect the i3s to have more power, lower stance with improved handling, wider tires and at least one new color that's only available for the i3s. Thinking red, but I'm a bit biased I guess!