Salesforce Platform Developer II superbadge

Update:

As of December 15th 2017, the final two superbadges; Lightning Component Framework Specialist and Advanced Apex Development are now available so you can complete your PDII journey and get your hands on your well-deserved Salesforce developer 2 certification! At this stage the best public information on the remaining two super badges is: The other two are in development now with a release date set for later this year [2017]. Source Additional Source - Changes to the Salesforce Certified Platform Developer II Credential:

Q: When will the additional superbadges be available?

A: The Apex Specialist and Data Integration Specialist superbadges already exist in Trailhead, so you can complete those now. The remaining two superbadges are currently in development and will be available before the end of 2017.

Q: How to ensure my Trailhead and Webassessor accounts are linked?

A: Today, there is nothing required of you to link your Trailhead and Webassessor accounts. However, stay tuned for instructions in the coming months for linking your accounts. Now that Trailhead has merged with Salesforce University I suspect you won't need to do anything to inform Salesforce except maybe link your existing Trailhead account to what you used for Salesforce U. Consider linking you certification account to your Trailhead account now. See Show Trailhead Badges or Salesforce Certifications on Your Community Profile Otherwise, wait until the official word on what is required to come out.