A large portion of conference audiences now diligently snaps a photo of every slide that the keynote speaker presents. Some implications:
You can no longer hide secrets by quickly going to the next slide. A high resolution camera got all those quarterly sales numbers in that nano second the slide was one. If you don’t want things to end up in the public domain, don’t put it on a slide, not even small. Yes, that might mean investing an extra half hour recreating that graph from the budget document.
The opposite is also true. Slides have a second use, pondering over them after the big presentation. This means you could add more content than you normally would do for an in-person presentation. One way to do that is to use an “explanation box”, like this feature in the SlideMagic presentation app. The main slide and the explanation are clearly separated.
You could take it even further by designing slides explicitly for the photo: for example, a calculation how you got to a certain number. Show it, say what it is, invite a picture, and move on.
The SlideMagic presentation software has an explanation panel that you can slide in and out.