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We all know by now that the production AWD Model Y will have a rated range of 315 miles from the prototype's 280 miles. I don't believe there is any way that this is possible unless the Model Y has a new battery pack with greater capacity. I just don't think it's possible for the Y's aerodynamics or motor efficiency to be so greatly improved over the 3 for it to only lose 7 miles vs the 3 AWD's 322 miles.
My guess is that Tesla has gone away from the 3's four modules and filled the excess space with more cells which has gained around 5kWh of usable capacity. I think this new pack will be used in the Model 3 starting in Q2 2020 which will boost the AWD Model 3's range to about 350 miles rated range.