I have cancelled orders because of the time it tookt for a collection or product to become available and I have also come back at a later date and opted in again when I saw something I wanted soon to come out.
Today, I checked on several items in community pricing or pre-pubs to see where they stood in regards to a release date.
The one on the NT Philologia in Spanish (I write from memory) had a red line indicator showing how it stood as far as "gathering interest" goes.
Two or three others just show the bidding price. It would be great if we could see a red line graph for all the items we bid on or in community pricing so that we could have at least some indication as to whether waiting is worthless or when we might think we could expect a product.
Has anyone else had such nasty thoughts? 
Ergatees