WTF!? When GW has done so much work in the last 12 months to improve the quality and content of codexes and army books they do this? They may as well just have the front cover of that WD being a picture of them taking the sisters range and dumping it in the bin, to make it clear exactly what they think of them. I've been a stauch defender of GW through the recent pricing and finecast debate but this is a spectacularly bad move.
Who in their right mind at GW thinks that Sisters players are going to be happy about having to carry around and flick through one or even two copies of WD to find their rules. This is a purely commercial decision, designed to bring new palyers to the sisters by them going 'well I already have the rules and don't need a codex, so I might as well buy some of the models'. It may bring them new players, but it is insulting to exisiting sisters players (and I'm not one of them btw). Poor GW, very poor indeed.