You can upgrade your current theme to Online Store 2.0 by migrating your current theme templates to the new architecture.

Upgrading to Shopify Store 2.0 Benefits

Action points for the shopify 2.0 and theme upgrade 

• Upgrade to shopify 2.0
• Theme upgrade latest version
• Static pages layout
• Dedicated collection pages 
• Dedicated product page based on collection
• Main category pages layout
• Sections layout pages
  
• Metafields
  
• Site performance