You can preorder an ESP32 module(with 4MB flash) from SeeedStudio[1] right now.
[1]: http://www.seeedstudio.com/ESP3212-Wifi-Bluetooth-Combo-Modu...
[1]: http://www.seeedstudio.com/ESP3212-Wifi-Bluetooth-Combo-Modu...
Some description above the pic:
• The size of ESP-3212 Wifi module is 16mm x 24mm x 3m.
• The ESP-3212 deploys 4MB SPI Flash with WSOP-8 package. It also uses 3DBi PCB antenna on board.
ESP3212 is an module, ESP32 is the chip.