Based on weight
I Would Truly consider if the weight goes below 400g, I used an old formula and I assume considering the similar form factor to Mini it should, considering Mini at 7.9 is 312g, so iPad at 9.7 should be about 383, + add some more for the display so I think 400 is possible, if yes I would rush to get it,
Btw do we expect any further updates to the display? Or will it be the same? Any chance it becomes like the iPhone 5 where the display is closer to the glass?