IEC standards published:

• 65C/223/FDIS - Digital data communications for measurement and control -
  Fieldbus for use in industrial control systems - Part 3: Data link service definition
  
  
• 65C/224/FDIS - Digital data communications for measurement and control -
  Fieldbus for use in industrial control systems - Part 4: Data link protocol specification
  
  
• 65C/225/FDIS - Digital data communications for measurement and control -
  Fieldbus for use in industrial control systems - Part 5: Application Layer service
  definition
  
  
• 65C/226/FDIS - Digital data communications for measurement and control -
  Fieldbus for use in industrial control systems - Part 6: Application Layer protocol
  secification
  
  

All four documents comprise the following Fieldbus types:

Type 1 (former IEC Fieldbus Technical Specifications, TS 61158-3/-4/-5/-6)
Type 2 (Control Net)
Type 3 (Profibus)
Type 4 (Pnet)
Type 5 (High Speed Ethernet Specification of the Fieldbus Foundation)
Type 6 (SwiftNet)
Type 7 (WorldFip)
Type 8 (Interbus)

Details in English
Details in German