Crafting Again:

I have read in other places that GM Crafting has changed and now there are specializations. For instance, I have a toon that is a GM in Metalsmith and Tailoring. I have heard that he can only specialize T6 in one of those areas. Is this true? If so, what is the new arrangement for GM tiers and specialization?

By the way, thanks for the replies to my questions earlier in this thread.