Eurobricks member demitri has provided a list of set names for the Summer 2015 wave LEGO BIONICLE sets. The information comes from a list that they saw from an import company. Just2Good also on the forums has also backed up the set list as well.
Subsequent replies on the thread suggest that the Mask Maker is Ekimu. I’m don’t follow BIONICLE as closely as some of our readers here do so if you have some sort of insight, let us know in the comments below of what you think the sets are about.
Skull Warrior (70791)
Skull Slicer (70792)
Skull Basher (70793)
Skull Scorpion (70794)
Mask Maker vs. Skull Grinder (70795)