Seeing similar issues myself. Been out of town for the past week and a half. Had 0 issues zoning, with no hang-ups before. Now...
Well, it's a different story. 10 toons all seeing anywhere from 600-2k ping. Very long zoning/loading times. Went to zone into Everfrost, and all 10 clients crashed to login after a very long zoning time. Loaded clients back up, now seeing 3k ping.
Started around 9:30am central time, now 10:10am, 12/28.
Edit: While typing this, I had 3 toons go LD after seeing a 12k ping. That never happens normally....