Due to development and secrecy on a nation level, GM could not meet the deadline of the beginning of the show. However, you may be able to expect to see it in an upcoming show. The research and current advancements in technology makes developing a product over a long period of time difficult, because you have to make sure your product will be up to date. It is a tough task but with GM's current design team, I think that anything can be done. You can likely expect a release this year.
Thank You for your cooperation.