The rumors about the WT being reunited are false in this chapter. They are just rumor at this point, otherwise the timelines wouldn't work out-- and Mat wouldn't be under his restriction from Verin.

Here is what Sanderson said at a signing last year (as reported by 13th Depository):


Q: Can you clear up the timeline issues? How do Mat, Perrin, Rand, and Egwene all match up in the timeline?

A: The Gathering Storm begins sometime in April. It ends around the end of June/beginning of July. However, Perrin advanced very little – only about 2 weeks. Mat advanced a bit more, but was still about a month behind Rand and Egwene (this gets an astrix as a MAFO), but Mat traveled to Caemlyn about 30 days before the end of the book – he emphasized 30 days and asked if I understood the significance of that – I said that I do.(Interpretation: Mat will wait in Caemlyn for the full 30 days without opening Verin’s letter – but I still think he’ll open it eventually).
If this is true, then Mat would no longer be under this restriction from Verin.