Is this the Blizzard's first step in making Wo W free-to-play?
And is that a change you want Blizzard to make for Wo W?
Update: Blizzard has released a full FAQ on the new system, which details (among other things) the restrictions on the trial accounts.
It looks like our pie-in-the-sky dreams of building a guild full of level 19 Pv P twinks on free trial accounts might be out of our reach..now.
However, lapsed accounts may be invited by their Battle Tag friends who have an active subscription even across realms.