And here it is! If you heard about Nucleo-144, then it's true!
STMicroelectronics released new development board called STM32 Nucleo-144 (STM32 in LQFP144 package).
Extension of "Nucleo development board family" is totally logical step to possibility of using another peripherals because only Arduino connector is quite horrible for STM32 microcontrollers.
Nucleo-144 combines existing Nucleo board and Discovery boards partly. It contains Morpho connector, new Zio connector and Arduino connector.
Nucleo-144 includes ST-Link/V2-1 programmer and debugger.
It can be powered from USB port or external adapter with 3.3V or 7 - 12 V.
The board contains other peripherals as USB OTG, IEEE-802.3-2002 Ethernet connector, 3 LEDs, 2 buttons (USER and BUTTON) and 32 kHz low frequency oscillator.
Nucleo-144 are supported by IAR?, Keil?, GCC-based IDEs (AC6 - http://openstm32.org), ARM?mbed? IDE.

Nucleo-144 will be with microcontrollers:
STM32F207ZGT6
STM32F303ZET6
STM32F429ZIT6
STM32F446ZET6
STM32F746ZGT6

Price of this version is $23.00.

Another information find here: http://www.st.com/web/en/catalog/tools/FM116/CL1620/SC959/SS1532/LN1847/PF262631