The '67 molds probably became the bogus "for 1968." I don't know if AMT then made them into the '69 annual (and promos), but if they did, they did a MUCH better job of it than MPC did. The AMT '69 is different enough that it might well be all-new tooling, and probably is.
The '69 annual DID become the aforementioned funny car, though. Be interesting to know if the original '69 interior, chassis, etc. molds are still around. The body COULD be brought back to stock, if Round 2 really wanted to. Not a whole lot of incentive to do so, however, with the excellent Revell kits readily available.