From my small understanding--the answer is no, you will not see CHDK ported to an A70...
CHDK is for the Digic II and III cameras. The A70 appears to have a Digic I chip-- and also uses another operating system too (DOS?).
It is not that it cannot be done--but it would be a completely separate project as there is nothing really similar between the current cameras and the older models.
Sorry,
-Bill