Hello. The best and most reliable information can be found probably on Guild Wars official site. I think downloads of additional features is for free since theyre intended only to improve the existing campaigns, just like Microsoft Windows patches which are released and can be downloaded for free. Ive also heard about Asura Miniature and there is the possibility to enable that race by buying a copy of certain PC gaming magazines in North America and Europe in which the code for this feature will be provided, but I must say I dont like it very much. For other patches you can also look all those gaming sites, and there are probably links for patches.