Is there a plan to add say OSPV3 and more IPv6 coverage in this course in the future?
Although not included in the list of topics for the CCIE Infrastructure course, there are lessons about OSPFv3 and coverage of IPv6 topics in the following course:
There you will find examples of OSPFv3 as well as various IPv6 topics. These along with all of the topics in the CCIE Infrastructure course cover the bulk of the topics in the certification exam.
I hope this has been helpful!