Just in case you wanted to know what the deal was with Arena ratings as we all headed to level 80, let Bornakk clarify for you -- while level 70 rated fights will still count, levels 71-79 are back to skirmishes, and rated fights can only happen again at level 80. And while Bornakk doesn't mention season timing at all (does Blizzard ever, beforehand?), our guess would be that they'll hold off on announcing any new PvP items until a good number of people have had a chance to level up to 80 and get situated in the brackets -- of course, depending on how fast people level up, that could be pretty quick.
But he does say that there will be no more new level 70 rewards, so what's out there right now is what you get. What we still don't know is whether Arena points from level 70 will carry over into the level 80 bracket, or whether there will be a complete reset of all the ratings and totals for the new bracket. There are good arguments for both sides (some players want a fresh start, while others don't want their winnings so far to count for nothing), but so far we haven't heard anything official yet.
So there are still a few things for Blizzard to decide with the higher level Arena system, but they've got time -- it's unlikely that they'll make people rush to 80 just to get involved in the Arena. It seems that when these next ten levels of content come out, Blizzard will switch some focus back to PvE and battleground PvP rather than the Arena game.