User blog comment:ChronosOmega/Brickfair New England 2014/@comment-5041674-20140511031454/@comment-5898771-20140511132705

If you make a BZP account and send in a Karda Nui themed MOC to Brickfair Virginia 2014 (the last convention this year that BZP attends officially), you can get a prototype piece (though I'm pretty sure I have the last Mohtrek).

This perk will continue in the future, it's just that we don't know the 2015 theme yet (but it probably won't be Karda Nui).