As far as i know, it only ever was a strong idea, not something that was officially announced.
My local gaming store still has Clan Box Set Expansion listed with availability date "2010?" even though that thing was cancelled long ago. I wouldn't put much trust in retailer listings for products not officially announced or listed as published on publishers sites.
Pure speculation, don't read anything into this.
Considering that there is no introductory box set in print at all at the moment (as far as we know), and that the next one might, i emphasize might (because i can't recall what was said exactly), be different format... Well, i speculate, that perhaps the next one is a hybrid (or more like, contains both starter rule sets starter rules). If there is one.
EDIT To be honest, i wrote this speculation bit in hopes that it might end up being true.