I haven't got my hands on one of these modules yet but hoping someone else who has can confirm this for me.
According to the schematic posted below; (From ESP-12S user Manual)
viewtopic.php?p=55893#p55893
Unlike the previous ESP-12x units the new ESP-12S has the required pull-up/down resistors and should be in running mode by default with only VCC and GND connected.
Can anyone confirm that for me please?
Thanks