The edition number shows which print you have within the limited edition of the collection. For example for a size 15 x 20 cm you may have 2/8 (because their are 8 editions available in total) which means you have the second print out of eight.
No. Once an edition is sold out, it will not be reproduced in the exact same way unless stated otherwise.
The remaining availability is shown when the product size has been selected whenever possible.