Because we calendar champions are considerate chaps, that know better than to harass the good lads at LW with repeatedly stating what which we can all can agree upon, namely that calendars should have top priority.
Well, it is probably due to the fact, that LW has already stated, that calendars is a thing they really want to provide, that a lot of the work has been done, and that it will come - if not tomorrow, then hopefully soon :-)
Soon meaning sometime after the present priorities (PE and WE) and before the next millenium.