I just received this email from GoBallistic:
Thank you for your interest in our Ballistic products. We will be producing a Ballistic SG case for the Samsung Galaxy Nexus Prime. Please check back on our webstore at www.goballisticcase.com for the exact release date. However, we will not be producing a Ballistic HC case for this phone.If we can assist you with anything further please feel free to contact us.