From Rothgar on the EQ2 Forums:

The merges are still going fine.  The chat/mail portion of the merge is a little behind schedule unfortunately so chat may be down longer than expected.  I’ll try to provide an ETA later today.

Tonight, Kithicor, Butcherblock, Mistmoore, and Permafrost all go under the Server Merge knife, so this means all servers will experience some loss of Chat functionality, in-game Mail, and Friends lists. On the Najena -> Unrest merge, this worked out to about 12 hours, so we expect that tomorrow, there will be 12-14 hours of these features being unavailable on ALL servers during the heart of the merge window.