Nobody really knows how 2.7 will work, once it's created. But, yes, there is a good chance that the developments which forced the creation of 2.7 will, once they are ready, be pushed downward into 2.6 and 2.7 will fade away. It all really depends on the nature of the changes, however. Someday, something sufficiently disruptive will come along and there will be no choice but to push forward to a 2.8.
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