Besides the above, there basically was a memo about this, too. 
Still only know that the C-7s are coming "soon," but no word on exactly when or pricing (I'd assume similar to the C-5 if only because they're nearly identical, but maybe a bit closer to the list price then their near-perpetual "sale" price of the past if supply is still constrained...or possibly more if the 700-series Z-Wave chip is more expensive or if they incurred other expenses like certification; all just a guess).
In the meantime, the secondary market (eBay and the like) seems to have some new or slightly used hubs, though not all are cheap. 
