hmmm, i was under the impression they were going to be an all metal army, however if its true they'll have interchangable heads (steel legion/valhallan style), then it wouldn't surprise me if the squads were plastics.
Seeing as there is a battle force coming out, it is probable there will be quite a few plastics... thinking about it.
Can't wait anyway, i want my Army to have a bit of variety to it (currently have a platoon of Cadian models, a platoon of Catachan models and small platoon of Steel Legion models(only got the Command Squad and 2 Squads, rather than the 5 Squads the Catachan and Cadian platoons have available to them).
Will there be a new guard codex too?
No, and if there was then i'd personally go on a murderous rampage through the GW H.Q. in Nottingham, the Orks, Dark Eldar and Eldar are in desperate need of a new codex, i'm already irked by the extras the Guard will be getting in City of the Dead.