Does anyone know if the Floating point versions of the K10/K20 will be pin-pin compatible with the current versions in 100 or 144 pin QFPs?
Since the FPU is an option in the Cortex M4 core it will not affect the pin out of the parts so I don't expect that there will be a difference due to this.
However I would contact your freescale representative about details of which parts will be offered with the FPU. I understand that the K70 will be the first part (in the next month or two) but it may be that the option will be restricted to the larger, higher speed parts and not be available for the K20 (I don't expect that there are plans for offering it in the K20 so you need to make sure before defining it for project use).
Maybe the K20 Family Product Brief will help you (http://cache.freescale.com/files/32bit/doc/prod_brief/K20PB.pdf)
I think the Devices will be pin-compatible.
I does look as though the FPU is planned for the 120MHz, 144 pin version of the K20 with 1MByte Flash memory and 128k SRAM.
Nevertheless this is not yet available to order (see http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=K20&nodeId=01624698C9&tab=Buy_Parametric_Tab&fromSearch=false for presently orderable parts) so its suitability depends on when the project needs it by.
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