A large client patch has been released in preparation for the November update that should be here any day now. The patch is just under 200mb in total and makes up the bulk of the update. On release day there will be another smaller patch of around 10mb.
For those of you in far off places and those with slower internet connections, please be patient with the patching process - it might look like it's not working whilst it downloads large files as the progress bar will not update until each file is finished.