I think he'll likely return to the tour during the February 'South American clay court swing'.
Since he's already committed to Acapulco (which doesn't start until the end of February) I think he'll probably start back at the 250 clay court tournament in Sao Paolo in mid February (ideal as it's a small clay court tournament with a relatively weak field).
Playing those two clay court tournaments would then prepare him for Indian Wells and Miami in March.
I wouldn't put money on him appearing there. Wouldn't be surprised to see him play nothing but clay from now until the FO.