I own 4 pairs of Cumulus 12s.  The 13 is nothing like them.  Whereas the 12 is soft and cushiony the 13 is stiff, especially in the heel.  It seems designed now for over pronators whereas the 12 was for a neutral gate.  So, if you love the 12, try on the 13 before you buy.  Don't assume it is anything like the 12.