Man this is awesome, if its not going to happen a release like that your suggestion could be an awesome themed army.
Also I think skaven will not have a huge realese but just new models for old units (skryre in particular) : they already have centerpiece models but maybe GW would expand the range and lore of eshin with some other realese in the far future. (tough as a skaven player for the last 10 years i would love a tons of new models but that is unrealistic)