I'm worried Roeder will go for 4-5-1 too. Newcastle really need to be playing 2 strikers when their main striker is as inconsistent and frustrating as Ameobi.
I think N'Zogbia and Milner could get phased out, or end up playing off Ameobi in the old "oh shit, we've loads of injuries, let's put Dyer behind Shearer" position. This would be a shame, as they're both great players, and Milner clearly wants to be playing regular football.
The injury problems need to be sorted, possibly by going the Sam Allardyce route and bringing in more technical training facilities.
Charlie - what are your thoughts on defenders then? I liked the idea of Gareth Barry, simply because he's versatile and fairly consistent, and seems a decent enough guy - but I don't see him leaving now O'Neill's arrived.
I think we need an experienced, influential centre back to control the defence and give Taylor and Bramble the benefit of his experience (and a bit more competition.) Craig Moore's good, but he hasn't got the gravitas or the depth of experience.
I think Gravesen's the last thing we need if he's getting involved in fights with teammates. Roeder's riding a wave of goodwill, but I don't know what he's like in terms disciplining players, and further scandal/disarray could be his undoing.