I guess, the cost to make sig-del ADC is quite high, on that making it for 40nm chip may not be feasible right away. I read in the same forum, someone asked the same question and Cypress is taking it as input for future feature addition and improvements. May be in future release, designers will get this done.
But I am not sure if UDB along can do sig-del ADC by itself.
While I'm checking on whether we have tried out such an implementation using UDBs, I can say that it is theoretically possible but we need an implementation to gauge the real world resolution numbers.
I'm (slowly) learning to use the PSoC Analog Coprocessor with view to developing a product with it when the chips are available (June, I hear) and starting to fall in love with the Universal Analog Blog architecture.
I'd venture saying a PSoC 6 with UABs would be game changing, at least to me, though maybe I just don't know the game very well :-)