I know IDW has some digital comics -- I think they have an iPad app, for one. No idea if either D&D comic is part of that, though. Check their website, I guess.
there is a review of this comic in the reviews section of this website http://www.enworld.org/forum/en-world-official-reviews/299130-review-dark-sun-comic-issue-1-idw.html
Note: the review does have spoilers, though the section that reviews the story elements does contain spoilers and *is* labeled as such. So just be mindful of that if you don't want to see the spoilers in the story, pay attention to the warning when it's coming.
This comic is a very different beast from the core D&D comic (as it should). The humor is more downplayed and the art has harder edges. While not immediately as enjoyable as the core comic, it is still entertaining. I give it a 3 out of 5.