It's finally here! The MegaSquirt-III is a drop in daughter card that greatly expands the MegaSquirt's functionality.

We now have complete, ready to run MegaSquirt-III ECUs. This is the basic, batch fire version, but can be expanded to add sequential injection and 8 channel ignition control with an MS3X board. As it is, you'll gain a lot more processing power, speed, and features over the existing MS1 and MS2 systems even without the MS3X.

The MS3 daughter card on its own will give you all these features and more:
VE and ignition tables are now both 16 x 16
0.1% steps on VE table, 0.1 degree steps on ignition table
Socket for an onboard SD card - no laptop required for data logging  (SD Card not included)
Built in USB port
GM stepper IAC control
Closed loop idle and mixture control
CANBus communications for interface with GPIO Board, IO Extender, or other devices
Staged injection
Native support for many different OEM trigger patterns

The MS3 also gives you a starting point for even more expansion. You will be able to connect the headers on this board to additional hardware, such as the MS3X board to enable features like these:
8 channels sequential fuel control
8 channel sequential ignition control
Individual fuel and spark trim for cylinder by cylinder tuning
2 and 3 channel PWM IAC control
2 stage nitrous controller
Table switching for multi-fuel engines
2 step launch control

For complete MS3 documentation, see ms3efi.com.
And more!