Thanks all. I will check my miles in mid Jan and calculate where I will be at 2/28. Then try to get some extra flights IF I will be close to the upgrade mileage level.
This does seem like a raw deal. Why not just keep that counter going? Or at least prorate the upgrades for % to 10K miles at 2/28. I can imagine some teed-off folks who got reset to 0 with 9,000 miles at 2/28.