A paper describing our proposed approach for applying GRADE ideas to network meta-analysis has just been published in PLOS One - Salanti G, Del Giovane C, Chaimani A, Caldwell DM, Higgins JPT. Evaluating the Quality of Evidence from a Network Meta-Analysis. PLoS ONE. 2014 Jul 3;9(7):e99682.
This paper was one of the outputs from the Cochrane-funded CMIMG Methods Innovations Fund project.