There are a lot of ways they can go. I feel confident they kill the X (and the 6s for sure) because if the Xs is $900 as rumored, it would be hard to drop the price on the X to fit it into the lineup.
My first thought was something like this:
SE: $350 ($300?)
7/7+: $450/$570
8/8+: $550/$670
6.1” LCD: $700
Xs/Xs+: $900/$1050
But that leaves the 8+ and the new 6.1” way too close to each other in every way (price, size, specs). So maybe they kill the 7 entirely and price the 8/8+ at $500/$620? Or kill the 8 entirely and leave the 7 as priced above, creating a clear price separation between the new models and the budget legacy models? Maybe even kill the 8 and the SE, leaving the 7 as the only legacy/budget model?
Lots of possibilities. I don’t think any individual existing model is guaranteed to be there this time next week.