I can only tell you that's not an ESP32 but an ESP31; there's no ESP32 chip released yet.

At the moment, not yet. The I2S module in the ESP31 is much like that in the ESP8266, so yo can use those docs plus the SMS emulator in the Github repo if you want to use that. The I2S module in the ESP32 is a lot more advanced, but there are no documents for that yet, unfortunately.

No idea about the SPI, but the ESP32 is going to have a modified I2S module. The DMA capabilities that has will stay, but it will also be able to output/input parallel data so you can e.g. send images to a parallel LCD using DMA.

Yes. If I recall correctly, the ESP32 has three hardware SPI channels, one of which is used by the flash.

At the moment, we only have the FreeRTOS SDK. Because it's easiest to harness the dual-cpu nature of the ESP32 using a threaded OS, in the short term at least the plan is to keep this as the only SDK for the ESP32, with maybe an added compatibility layer so espconn-based applications can be ported e...

Sure! I can't comment on the DMA stuff, but I do know the SPI, I2C, I2S and PWM peripherials are real hardware peripherials. Plus we have some interesting things in there that can possibly help make bitbanging a fair few protocols we do not have natively a whole lot easier/quicker.

We have I2S audio support; test code for this is already in the SDK and working. If you want example code: the Sega Master System emulator has a FreeRTOS implementation of a queue-based audio output driver for I2S. As far as I know the I2S output is standard; any codec/amp that supports standard I2S...

We have a compatibility layer between FreeRTOS and the espconn API in developement here at Espressif. I suppose it'll make it into the SDK when it's ready.

There already is Arduino support. At least for the things that have been disclosed so far. Support will be added as Espressif releases anything new (last update was committed on Dec 18, 2015). https://github.com/me-no-dev/ESP31B Aye. Just for clarity: I wasn't trying to sweep the excellent work you...

I can't answer all questions, but: 1. Yes. We have plans to bring and/or help the community with bringing Arduino to the ESP32. 2. Yes; at least our own SDK will have support for using both cores. The Arduino SDK probably will eventually also support two cores. 5. The plan for this moment is to impl...