This new version of the ESP8266 WiFi Module has increased the flash disk size from 512k to 1MB.
Features:

• 802.11 b/g/n
• Wi-Fi Direct (P2P), soft-AP
• Integrated TCP/IP protocol stack
• Integrated TR switch, balun, LNA, power amplifier, and matching network
• Integrated PLLs, regulators, DCXO, and power management units
• +19.5dBm output power in 802.11b mode
• Power down leakage current of <10uA>
• 1MB Flash Memory
• Integrated low power 32-bit CPU could be used as an application processor
• SDIO 1.1 / 2.0, SPI, UART
• STBC, 1×1 MIMO, 2×1 MIMO
• A-MPDU & A-MSDU aggregation & 0.4ms guard interval
• Wake up and transmit packets in < 2ms>
• Standby power consumption of < 1>