Thank you for contributing this. I had been wondering the same thing. It seems you and I are the only ones holding non-hotel-linked tickets!
So to confirm, a CM told you that the new park reservation system will not allow you to reserve, say, three days in one month and three days in another month, using a single 6-day pass? They must be used in a single 10-day period?
This is logical, of course, as those were the expectations at time of purchase (and the reason for the "volume discount." However, it is misleading for the tickets currently to read, "valid any of the dates..." They ought to read, "may be used within ten days of any of the valid starting dates...." or some such.
Did the CM explain how the reservation system will restrict this?