First, thanks for being a part of the OpenSpending community. It's an exciting time to be involved with lots of changes to come!
We're hard at work on OpenSpending Next and are starting the process of migrating existing public datasets. In the process, we are going to be putting the old OpenSpending into read-only mode for up to two months. During this period, no new datasets will be able to be created on openspending.org. While we still want you to be able to access existing datasets, we don't want to risk losing any new datasets created during the transition.
Edit (18 January): One major motivation for this move is that users encountering the old OpenSpending site periodically run into issues when they try to import new datasets. Unfortunately, we don't really have the resources to support and fix these issues on the old site while we build the new one, so we have decided to move to read-only mode so we can focus all our effort on making the new site great!
Thanks for your understanding. Leave a comment below if you have any questions about this or any other aspect of the upcoming transition.