I don't really know what to expect in my lifetime with regards the subject of Climate Change for certain articles I read (for example some of the posts on Arctic News) and comments on certain Forums tend to depict something apocalyptic whereas there is also a number of comments on certain forums that tend to be somewhat more optimistic.
I guess a list of what I would expect to happen would including
2013+
The Arctic melt out during the summer perhaps during late June, July or early August
Increasing outputs of methane into the atmosphere
The expulsion of methane from the Permafrost in a year or two
The decrease of food reserves as a result of extreme drought in the Breadbaskets
The breakdown of society, either gradual or swift within either a year, 5 years, a decade or a couple of decades.
I am very unsure of certain events due to the fact that my understanding of them are poor and thus with regards the more extreme scenarios I just make guesses.