We want to provide some information about the direction of the Arena
system. Upon the release of Wrath of the Lich King, players will find
they are still able to access the Arena system at level 70 for rated
matches. Those competing in the Arenas at 70 will still be able to
attain items using Arena points and rankings; however, we do not
currently plan to offer new items or titles for this bracket. Players
who level past 70 will have their Arena points reset to 0 and be
removed from all Arena teams in the level-70 bracket.

Two new
skirmish brackets (71-75, 76-80) will be available for players who wish
to hone their Arena skills while leveling in Northrend. Those who reach
level 80 will once again have the opportunity to create new Arena teams
and play in rated matches once a new season starts. New items, titles,
and end-of-season rewards will be offered to the most successful teams
at level 80. Additionally, the sets released for the Arenas in Wrath of
the Lich King will no longer share aesthetic similarities with tiered
raiding gear. We want those equipped with the best PvP rewards and
those with the best raiding sets to stand out from each other. Players
at level 80 will also have the opportunity to compete in two new Arenas
featuring challenging new layouts, terrain hazards, and moving
obstacles.

I hope the lvl 80 arena gear looks better than the most recent season. That was a pretty huge disappointment. Not that I own any season 4 gear, but if I did, I'd be a little uglier.