The digital revolution certainly has had it's effects on audio post as far as the sheer amount of films that are being produced on very small budgets. This is good. More stuff to work on. However, the schedules are getting shorter and shorter and we're expected to do more in less time. This is not so good. My last two projects were both digital. One was David Fincher's Zodiac which was a huge budget and I got 18 weeks work out of it. It was shot digitally on a Viper Cam and edited in Final Cut Pro. The next was an animated feature that we had to do in nine days! These are the two extremes.
I wouldn't necessarily blame the digital medium itself for changes in our post workflow, though. The digital revolution within the audio world itself has much more to do with it. With DAWs, Soundminer, digital field recorders, etc our job has become a lot easier and more efficient. It used to be that an apprentice would spend months or even years learning to cut mag before they could move to assistant or full editor. Now, anyone with an MBox can hang his or her shingle as a "sound designer" and be fully trained on the equipment before he walks in the door. I'm not saying this as an old curmudgeon, I AM that guy who learned Pro Tools inside and out before I got hired.
The biggest change that we're starting to see is the way films are mixed. Many facilites are moving away from the large-format consoles and huge dub stages in favor of cheap alternatives like Digidesign Icon systems and smaller 5.1 sound design rooms for premixing. This is really just a matter of economics, unfortunately. In order for post-houses to stay competitive and be able to work with smaller budgets, something has to be sacrificed. The role of sound editor is slowly morphing into mixer, except we don't get paid as much.
As far as recent changes in digital projection formats, this has had very little effect on what we do. We still deliver a Dolby printmaster and all the usual stuff. Film soundtracks have already been digital for decades now.
Picture follows sound! 