All rewards are calculated in spreadsheet. Participants can take out signatures. Should In case the campaign continues will current participants be given priority after applying ?
I doubt it will be back... Let's wait for their announcement later this week.
What I noticed is that older long term campaigns usually capitalize on ad exposure by running lengthy campaigns, and so they attract masses over a period while newer projects find it hard especially if the run for only about a month. Once the campaign ends people remove their signatures, and there will nothing talking about the project except the ANN. They then get forgotten in no time.