*thinking hat* The main buyers for this thing will be Who fans rather than roleplayers, so your bit needs to be accessible to non-roleplayers. Could you do a comparison of the different Who RPGs, accessible to non-roleplayers but also of interest to roleplayers? A case study (rather than an overview) would also be appropriate for this word length - an amusingly silly rule, a bit of roleplaying history, the sort of brief, amusing/interesting piece that the Big Issue has that you can read on the train.