16 step sequencer with 16 buttons
the step sequencer should also be able to act as modulaton source.
the sequencer buttons should be able to act as keyboard (for the desktop version)

                                                   (modified with a photo editor)

usb2 interface to get 16 stereo audio channels into the pc

more complex fm synthesis. the virus ti has 9 oscillators for the new hyper saw. some of them could be used as fm oscillators

more filter types.

option to import user created wavetables

multistage envelopes as modulation source

more lfo´s and envelopes

lfo modifiers like waldorfs microwave xt

more knobs

bigger display to interact with the new features