If you recall, we were recently told that there was going to be a WvW ratings reset at the beginning of the month. If you're wondering what happened to that, ArenaNet has decided to not implement the reset. Here's an update from Habib Loew:
We’ve been keeping a very close watch on this week’s matchups and, despite our concerns regarding the recent population shifts, it seems that many of the games are quite competitive. At the same time we’ve been evaluating some possible changes to the math we use to calculate ratings. After examining a number of new methodologies for weighting the outcomes of matches we have found that our existing formulas already do pretty much what we want them to do. Certainly none of the candidates that we tried yielded better results.
In light of the strong community response to the idea of a WvW ratings reset, the results of our ratings formula investigations, and our data on the current matchups we have decided not to reset the WvW ratings at this time. All existing WvW ratings will be preserved and the rating calculation methodology will remain unchanged. Any existing mismatches should be corrected by the system in relatively short order. Now that there is less volatility in the player base for each world we expect the quality of matches to improve more quickly. This is both because the rating system is operating in a less unpredictable environment and because more stable teams tend to produce better results.
Thank you all for your feedback on this matter, and for your patience while we explored the various options. The community response was a key element in our decision making process. [Source]