To sum up what (I believe) Yoshi wants out of the new engine:

- Able to process hundreds of character models (400?) in real time, as opposed to the current 40, without losing quality.
- Able to look and play well on high end computers, while also being able to scale down for dated ones.
- Able to play correctly on the PS3 hardware.

And for the new server engine:

- Streamline data processing.
- Make searching easy.
- Allow for characters from different Worlds to play content together.
- Able to process worlds smoothly.

And the new client software:

- Moddable user interface.


Did I miss anything?