After selecting the Cataclysm expansion from Chromie, there is no way to access the portals. The initial quest that takes you to Farseer Krogar in Orgrimmar is missing. I am trying this on my level 27Horde Death Knight.
Also, trying to report this in game is impossible as your report a bug feature keeps taking me to the US forums where it says I need a level 10 character to report, so posting it here!