M Eley,
There are several news feeds on this.
One has an x-ray of the blade:
http://www.history.com/news/2011/10/...d-in-scotland/
Others show a glimmer of shiny metal where the corrosion has fallen off.
I corresponded with one of the dig co-ordinators and it will be a year or so before they are cleaned/conserved enough to have a real good look.
Ric