Just copied/pasted what I said on another thread about this (see here).

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It has been "almost confirmed" lol.

In Live Letter IV [0:14] from November 2012, Yoshida says:

"We'll continue to look at the possibilities until the very end, but it looks like we will be able to provide this option."


EDIT: More quotes on the topic:

"With name changes, from a UI standpoint there would be problems with names being too long.
So if we were to make it possible to change names in 2.0, we would most likely have to adjust
the maximum length."
Yoshida on Live Letter II [0:25] from November 2011

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