Here is a list of few key things to watch out for.
1. How to leverage social networks for marketing. Facebook, Twitter, Google+ have got the consumer traction. How to leverage them for marketing is still to be discovered. Nothing so far has caused the disruption like what "Pay per click" did to search engines initially
2. Marketing automation. Consumers read what you have to say in your ads and website - but believe and take decisions based on what they hear online :). The good thing is everything happens online. These systems will need to get more integrated with consumers
3. The lines between Marketing and Customer Service is getting blurred. A disgruntled customer or a happy customer both can impact your brand - much more than your ads do