Update: Wow, just, wow.

This is an update to the post I made last week about the lightning bolt glyph. The post can be found here. GC made another post;

This is why I am often reluctant to post actual numbers. I think they end up launching more questions than actually providing answers. The 10 to 12% number I quoted was the additional amount we wanted to add with the changes post-Shamanism. If you recall, we did two rounds of buffs on Elemental. The first juggled the talent tree a little bit (and introduced Shamanism). The second changed a couple of additional talents (Elemental Oath, Elemental Mastery and the change to the Lightning Bolt glyph). For an Elemental in Naxx 25 gear, *each* of these rounds should have increased dps by about 10% between patch 3.0.3 and patch 3.0.8, for a total of about 20%. If you are in heroic blues and don't have as much spellpower, then you won't see quite such a lift from the first (Shamanism) round of changes. Note that the build on the PTR only contains the first round of changes, IIRC. Sorry for the confusion.

(source) The emphasis in the quote is mine. I see this as confirmation, Glyphs and talents are interchangable, but, apparently, only for some classes. I'm dissapointed.