I just ordered the besieger and halfing expansion from cundco and i asked them if they would make an exeption and include a spiel 2014 tile. This was the answer i received.
"thanks for your order. We're really sorry but the promo tile was exclusively for the Spiel 2014 and will not be sold (or give away) sepatately.
BUT, we'll include it in future special actions,maybe for Saint Nicolas, so keep your eyes open. ;-)"
So it seems we'll be able to get it on a later date afterall.
(P.s: Dutch and German Saint nicolas is on the fifth/sixth of december. It's like santa claus without the christmas, obesity and radio-active reindeer)