A new page has gone up on the official WoW site with lots of details regarding the implementation of Dual Specs (at least the current plans for implementation, these things can always change!). Naturally this is a great read for any class that's considering Dual Specs, but it's also an interesting read for Inscribers.
A few craft-related facts have been sprinkled in here which I wanted to be sure to point out. The very first sentence says "With the next content patch" which confirms Markco's assumption that dual specs would be released with the 3.1 patch. Then in the very first question Ghostcrawler confirms that there will be separate glyphs with the dual spec ability. So this is great news that glyphs are indeed included in the new dual spec system, yay! He goes on to say that switching specs will require a Lexicon of Power and that Inscribers will have the ability to summon one. I kind of like the idea that they've made Inscribers an active part of the process, which would seem to give us a new trade service for the community.
I would also like to point out that Ghostcrawler has officially referred to us as "Inscribers" in this interview. Lately I've been leaning more toward "Scribe" since it's short and has a rather historical vibe that's fairly relevant to our profession. However, I graciously defer to the designers and their phraseology. I tend to follow the Buffy model of nomenclature which states that whoever uses the name first gets the privilege of deciding how it's used =)