A flood of news recently. We now have an end date for Season Four. You have two weeks to make that final push for the titles. There is a chance this date could change, most likely being pushed back if issues arise with the 3.0 patch.
Also, an important thing to note. You cannot transfer until you have actually received your end of season reward if you are qualified. Don't say you weren't warned this time.
Upon the end of this Arena Season, teams and ratings will not be wiped, and will carry forward allowing players to earn points each week and purchase gear until the launch of the expansion (November 13, 2008)
End of season rewards will be determined by the ladder when the 3.0 content patch is released. You will keep earning points and keep your teams until WotLK is released, but competing after that point will only reward you with points.
Still no official word on when 3.0 will be released, but we will start updating things for the calculator/end of the season.
We've revaluated certain aspects of how the arena system and current arena season will be affected during both the next content patch, and the launch of Wrath of the Lich King. For starters, the current arena season will end in respect to the ladder upon the release of our next major patch. What this means is, we'll be taking a snapshot of the current season's ladder just before the realms are taken down for patch maintenance, and our normal process will commence to determine who is eligible for the end-of-season rewards. Teams and ratings will not be wiped at that time, and will carry forward allowing players to earn points each week (and buy gear) until the launch of the expansion on November 13th. Almost immediately before Wrath of the Lich King releases, all arena teams as well as ratings will be wiped and arena charter NPCs disabled.