changes in the xml file AFTER submitting to store

Oliver:

The simple answer is yes. Any changes you make to your RSS feed file (xml file) will eventually be updated by ITMS. Usually ITMS updates feed changes within 24 hours. However, the most recent changes I made in my feed files took almost 8 days before ITMS refreshed my listing.

One issue is clear. If you make changes to your image file, there is a high probability that when ITMS updates your database record, your listing in ITMS will show the broken link image for awhile. I've changed my image file twice, and each time, my ITMS listing showed the broken link image. Eventually the new image shows up, but it does take a long time for this day and age.

Good luck!