Bashiok 2/13/2014
@Metrolol: Our intent is for people to hopefully be able keep the titles forever if they hold it at the end of the season (e.g. when the pre-expansion patch releases), which yes, would create some fun competition before then. We need to verify some mechanics first to ensure that's even possible.
We have some time though until the Warlords pre-patch of course, and we will work to make sure everyone is well aware of the specifics for keeping titles and the cutoff time and has ample warning.