The last announcement made by Blizzard stated than the third arena season should start this week on live servers, tomorrow on US servers and Wednesday for EU servers; also honor vendor for season 1 stuff will be available when season 3 starts.

Most of your questions should be answered by Season 3 Blizzard FAQ, if not feel free to ask here.

New PvP Trinkets

- New pvp trinkets will be available from the honor vendor for 30,000 honor and 40 AV marks. You can also buy them for 75 Badges of Justice: link