Is a really fast (at least 100 MIPS) core with a REAL USART or two, timed from a REAL PLL capable of a really fast acquisition time and reasonable tracking range at least of +/-100 ppm, a USART capable of transferring data in full duplex and inserting a predefined format stored in RAM and transparently to any other processes in the MCU, with at least 63.75 kB of internal XRAM operating without any dealy to the MCU, along with the usual 64KB of internal program store, trivially reprogrammable of course, completely impervious to reset-related stresses, and an external bus that operates at full speed down to, say a 1 usec cycle, reprogrammable on-the-fly, of course.

At the moment I couldn't care less about those "other" (SCI. SPI, IIC, etc.) peripherals, since they could easily be synthesized in firmware, given enough performance. Some folks might want 'em, though, so I wouldn't rule 'em out, since I don't know what tomorrow will bring.

If you want it to fit a wide range of applications, you probably need 5-volt tolerance, though 3V3 is probably suitable as a supply. Yes, PLCC would probably be the easiest package to sell, though you could sell 'em on an adapter from TQFP to most anything previously popular. if you were to build one with, say, a 256 macrocell CPLD on board, and maybe some of that programmable analog hardware that some makers are selling, that could be really handy.

Without knowing what your capabilities and goals are, I can't really make a serious suggestion.

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