i saw these on eBay and they are old so I'm assuming metal but would be cool to have a few different models. http://m.ebay.com/itm/Warhammer-Lizardman-Saurus-warriors-nib-in-shrink-oop-/311564815388?nav=SEARCH
I would say it's safe to assume metal. The old plastic ones seam to be flat and all in one piece, so these are probably metal. Maybe someone with better experience with the older sets can say for sure.
No those are from the first generation plastic sets. (5th edition) they came in metal and plastic versions, I think the metal ones came in blisters, and the plastic ones came in the box. (you can tell by the bad fit at the neck) http://www.ebay.com/itm/Warhammer-L...817616?hash=item3d15819010:g:CggAAOSw5VFWLpdB
oh and slightly off topic, Did you see this army for sale. http://www.ebay.com/itm/Warhammer-A...218034?hash=item3f5f9f5872:g:SG8AAOSwoBtW5Mco Brilliant paint scheme.