I don't know where else to put this, so hide my answer if this is the wrong place (I've also checked around the site and am pretty sure this isn't up yet).
Pokemon Global Link has announced that the current Global Link linked to Gen V games (Black, White, Black 2 and White 2) will close on 14th January, 2014, in preparation for the move to Gen VI, and the new Pokemon GL will be linked to Pokemon X & Y. The new Pokemon GL is expected to launch in October 2013, coinciding with Pokemon X & Y's release.
It also says that some achievements are transferable, but has not listed which ones yet.
Pokemon GL - Notice