Blizzard's been hard at work adjusting a lot of WoW's game systems for Cataclysm, and one of the biggest changes in the pipeline is the overhaul of the inscription profession. You may remember the Path of the Titans alternate advancement system was axed in favor of making inscription, well, better. On top of other changes and a new UI, part of this task is adding a new tier of glyphs -- called prime glyphs -- on top of the already-existing tiers of major and minor.
Ghostcrawler recently had this to say about the new glyph system:
Several classes have had their glyphs worked on and updated as of this beta patch, but only rogues and shaman glyph passes appear to be "done," so we've listed glyphs for those two after the break.