Sorry Jim but the new RE18 hoop for the 15000 is not the same size as the 11000 RE hoop. The RE 18 is 5.5 X 7 inches. The 11000 RE hoop is 5.5 X 7.87 inches. That 0.87 inches difference in length makes quite a difference and designs that are longer than 7 inches will not fit in the new RE18.
Reminding himself to measure twice before speaking once, Jim says:
You're right of course. The 18 in the hoop name corresponds to its length of 180mm, a full 2cm short of the original 5 x 7 (B & RE). This is sure to cause confusion to those who have a "5 x 7" design that relies on the original Janome 5 x 7 measurement of 5.5 x 7.87. When such a design is used on the 12000 or 15000 it will automatically be promoted to require a larger hoop.