X-Wing 'Overlapping' ships question
Yes, this is an overlap.  Each ships move is completed in order without regard to what other ships may do in the future.

If the TIE fighter overlaps the X-Wing follow the procedure on page 17 of the rules to resolve the overlap before moving on to the X-Wing's move.

Reminder - the TIE fighter loses his Perform Action step as a penalty for causing the overlap.