1) Don't know yet. We are currently on stability testing and then the compiling of 1.04 will commence.
2) Of course. If we can help, we will. We will always support & fix GWX issues as & when they are discovered. Of course, we will do everything in our power to make sure it is bug free. However, 1.04 is a huge set of files and it's always possible to miss something.
Although this is the last patch/update for GWX, many of the GWX members will remain active within the community and will actively support GWX users.