Status:
- = Planned.
X = In progress, some work done.
* = Done.
? = Not sure if worth the effort or useful at all.
N = Decided against.

Version 2.4.1
X STM32F2 validation (so far testing done on STM32F4 only).
X Revision of the RTCv2 driver implementation.
X SDC driver port to STM32F2 and STM32F4.
- CAN2 support and CAN driver test on STM32F2/F4.

Within 2.5.x:
- Revision of scheduling strategy for threads at equal priority.
- Handling of Virtual Timer callbacks out of critical zone.
- Add normal API (not iclass) variants of the VT functions.
- Add the RTC service inside the kernel and port, remove from HAL.
- Add option to use the RTC counter instead of the systick counter into the
  trace buffer.
- Add a chSysIntegrityCheck() API to the kernel.
- Add guard pages as extra stack checking mechanism. Guard pages should be
  of the same type of the stack alignment type.
- Add a CH_THREAD macro for threads declaration in order to hide
  compiler-specific optimizations for thread functions. All demos will have
  to be updated.
- Runtime errors manager in HAL.
- Critical errors manager in HAL (to replace or complement assertions).
- Streaming DAC/I2S driver model and STM32 implementation.
- MMC_SPI driver speedup.
- USB driver model revision.
- MAC driver for STM32F107, STM32F2xx, STM32F4xx.
- STM32 OTG USB cell support for CL, F2, F4 devices.
- Add ADC3 support to the STM32 ADC driver.
- Update C++ wrapper.
- FatFs 0.9x integration.
- Nios II support.
- LPC17xx support.
- NUC120 support.

Within 2.x.x
- Software I2C implementation using a GPT instance for timings.
- Static memory allocation hook macros in kernel code.
X File System infrastructure.
X Implement the "transmission end" serial driver event on those platforms
  supporting the feature, so far only done in STM32 driver.
- Test suite overhaul, the API should be more generic in order to be used
  with different subsystems and not just the kernel.
- Reduce number of demos globally, add demos to a repository or on web site.
  Required in order to reduce support effort.
- FatFs wrapper.
- New device driver models: Clock, Systick, WDG.
- Add UART4 support to the STM32 UART driver (CL line only, HD has a nasty
  shared interrupt).
- Shared DMA channels support in the STM8L HAL.
- Device drivers for STM8/STM8L (ADC, PWM, bring them on par with STM32).
- Device drivers for LPC1xxx (ADC, PWM, bring them on par with STM32).
- Implement USB Mass Storage Class support and demo using the MMC_SPI driver
  as back-end.
- Batch testing of the ARM7/ARMCMx port using OpenOCD, with reports.
X Transactional flash file system implementation.
- Serial over UART complex driver driver, evaluate from the performance
  results if to make obsolete the current dedicated Serial driver.
- Official segmented interrupts support and abstraction in CMx port.
- MAC driver revision in order to support copy-less operations, this will
  require changes to lwIP or a new TCP/IP stack however.
- Threads Pools manager in the library.
- Dedicated TCP/IP stack.
? Evaluate if change thread functions to return void is worthwhile. 
? Add a *very simple* ADC API for single one shot sampling (implement it as
  an injected conversion on the STM32).
? Add a switch to enable/disable the priority inheritance algorithm in mutexes.
? ISO7816 driver over UART driver, both reader and card side.
? Merge the Coldfire branch in mainline (hardware missing).
? Merge the H8S branch in mainline (hardware missing).

Ideas for 3.x.x:
- MMU/MPU support.
- High resolution timers and tickless kernel.
- Multicore support.

Side projects:
X ChibiOS Wizard, UML modeling and ChibiOS applications code and
  documentation generator.