I have been able to do initial tests with the 1.5 version of the server and at the minimum I can report that there are no obvious error messages from any of the important plugins. The next step will be to make a temp setup with random maps, using the current full configurations of the plugins. Once that shows up without errors, we can basically upgrade the server.
I then still I have to go through the custom plugins like the shop and make sure that all new blocks are accounted for etc so we do not break the shop.
I hope I can do it this week. The issue is that I will be on a business trip until Wednesday night and I am not sure how much time I will have to do it. I would hope that I can do it until latest this coming weekend. I will then also close the current contest and put it up for voting.