1) Upload duplicates of images for each album (covers) and add them to some special tag or special album (e.g. “TopGallery”)
2) Add Link to different galleries for each image, so each image will be linked to some unique gallery
3) Create Phantom gallery and choose “TopGallery” as source.
Now your top gallery will be like list of albums where each thumbnail will be linked to separate gallery.
As for now Album’c cover is used only for Music Player. If mp3 file doesn’t have cover, then player will use album’s cover.
The big update for Gmedia will be available in a few days. I’m already testing comments and wordpress search to find gmedia items like Posts.