Some Simple things:
I'm sure the Prop team already has a great collection of major devices to add to 3.0, but there are a few smaller devices that I think would really come in handy.
A new more powerful delay. Maybe with a built in filter. A spectural style delay would be sweet.
An LFO device. Just like an all in one CV generator.
I'd like to see a synth with a built in rythmic sequencer for pulsating sounds.