I got a look at the new marine codex this saturday.
It looks rather good. There's a special table so you can give your own new chapter some special rules and units, all you do is select some advantages and then select the same amount of disadvantages from the tables.
I remember a rule called "Take the fight to them" which is quite good, you can have a squad armed with bolt pistols and close combat weapons rather than bolters as troops (instead of fast attack thanks to the remove jetpack thing).
And there's one that lets you swap your heavy weapon for another assault weapon.
The others escape me but I liked what I saw.
At this late stage of my army, it surprises me that I've only just bought some proper death company. I've had the usual bloodclaws with no space wolfy bits squad. while this is ok I suggest getting the metal ones, they look a thousand times better and it's worth the extra bread for the most iconic squad in the army.