Do you recall a couple weeks back when I posted about Mark Waid's digital comics concept? It turns out that the demo video in that post showed off some of the features of the new Infinite Comics that Marvel announced last night. In fact, Mark Waid led the team that developed it for Marvel. The video he posted looks to be an unannounced teaser for today's news.
As you can see below, time has been introduced as a story telling element. A page of comics isn't shown all at once; the artist can set the comic to show word balloons, frames, and focus points and allow the reader to advance through the comic one point at a time. The artist has other tricks in their toolkit, including inserting a flashback on top of a scene, changing the depth of field of a panel, slow zoom, etc.
This is rather different from current digital comics, where an entire page is displayed at once. ComiXology's directed viewing might help you go from frame to frame and zoom in on key points, but it's really just a cobbled together add-on to the original paper comic.
I wasn't too thrilled with it when I first saw the video, and I'd still like to see someone abandon the frame concept shared by all comics. But I am going to go buy the first comic to use this tech when it's available next month. You'll see it first in Avengers vs. X-Men #1, which is due out on 4 April. Marvel will sell the comic in their app for $.99, and you can get it for free with the purchase of the paper edition of the comic.
This is going to be the first truly new thing in comics in a while, and that alone makes it worth a long look. For more details, here is a brief interview of Axel Alonzo of Marvel:
P.S. If you want to see another comic where time is a story telling element, CBR pointed me at this 3 year old comic on Deviant Art. It's a very basic pen and ink style of concept that still manages to show off several novel concepts. (They're new to me, at least.)