http://www.bestbuy.com/site/Global-Promotions/null/pcmcat309300050007.c?id=pcmcat309300050007
3 tiers, up from 2. Spend thresholds are $1500 and $3500 respectively, from $2500.
Reward Zone Gamers Club appears to now be my Best Buy Gamers Club, program benefits seem to be the same.
Also...