UFO over easy said:
the new school of interesting drum and bass producers - Sileni, Polska, Jason oS for example - are doing things with the sound that wouldn't have been dreamed of pre-1999.
You could add Martsman and Pieter K here, though Pieter isn't making much drum and bass anymore (his recently released track with Klute on Offshore/Commercial Suicide was very nice, however, all lush sweeping synth melancholia drenched in cymbal splash).
There are others, plenty actually, who deserve more mention than I can do justice to in this piddling post. In addition to those mentioned in the thread already, Graphic, ASC, Mav, and Fanu come to mind. Klute still makes quality tunes with harmonic subtlety and complexity (not all, but some show a particularly gorgeous melodic approach, both restrained and simultaneously emotive, like: 'crosby', 'silently', 'acid rain')
But UFO is right, people like Jason oS and Sileni are important new voices, not only in terms of 'innovation' but in terms of musicality, thoughtfulness, compositional complexity, and sound design. What is exciting is that they are only at the beginning of their careers as producers (in terms of releases that are available, anyway), and neither seem particularly concerned about how they are situated vis-a-vis the history of jungle or whatever. They are simply forging ahead with total irreverence for the conventions of modern dnb, and doing so not in the service of 'innovation' but in pursuit of deeper music.
I know that Jason, for one, who is a close friend of mine, is concerned above all with writing the best possible music that he can. 'Drum and bass/jungle' just happens to be the template that he chose, because of the compositional freedom that the genre offers him. (He's played the cello for 20 years and is now studying digital sound design at NYU.)