Space Marine Centurions rules are starting to come out. While I do not yet see a stat line, weapons and special rules have appeared.
Please remember that these are not official yet (codex is not released)
via 40k radio
Centurions can be taken as Elites or Heavy.Heavy support are the devastator option. They come with twin-linked Heavy bolters and Hurricane bolters. Hurricane can be upgraded to missile and HB upgraded to Twin- Las cannon or Grav-cannon and grav-amp.
Can upgrade to omniscope which gives night fight and split fire special rules.
They can select a Land Raider as a dedicated transport.
Special Rules: Slow and Purposeful, Decimator Protocols(Can fire up to two weapons in each shooting phase), Very Bulky, Chapter Tactics, and TSKNF.
Elites are the assault option. They come with Siege Drills at S9, twin-linked flamers and Ironclad assault launchers. They can upgrade flamers to meltas and assault launcher can be upgraded to hurricne [sic!] bolters.
Can upgrade to omniscope which gives night fight and split fire special rules.
They can select a Land Raider as a dedicated transport.
Special Rules: Move through cover, Slow and Purposeful, Decimator Protocols(Can fire up to two weapons in each shooting phase), Very Bulky, Chapter Tactics, and TSKNF.
via GW-Fanworld
1. Centurion “devastator” come with Twin-Linked Heavy bolter and hurricane bolter for 60 pts. You can have up to 6 in a squad.
2. Legion of the Damned have flaming projectiles. All ranged attacks have ignore cover special rule.
3. Black Templars are in the book. They can not take some selections but have access to Centurions, Thunderfires, and so on. They have special rules for Chapter Tactics.
4.Chapter Tactics for the following chapters: Ultramarines, White Scars, Imperial Fist, Salamanders, Iron Hands, and Raven Guard. They have two special rules per choice.