The general trend for consumer computing devices seems to be away from the 'traditional' PC/Laptop and certainly more towards mobile devices, whether they be tablets or smart phones.
So I would say that Digital Forensics will get pulled in the same direction, especially the interaction between these devices and their cloud-based services. I see that potentially the kind of data that will be stored on physical devices themselves will only be files that are to large to be efficiently uploaded to a data center over current connections (aside from device configuration and Operating System artifacts). It will be an interesting challenge to work out how to get to the required data, not only from a legal perspective but also how to ensure a 'forensic copy' is acquired.
In order to 'stay ahead of the curve' I guess we'll have to keep our ear to the ground and see what the roadmap looks like for iOS/Android to see what features we may have to end up investigating.
Also, seeing what new web services emerge ('The Next Facebook') and what they leave in terms of artifacts on a system.
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