Had my card for about 13 months and received the upgrade offer a little over a month ago. I initially was approved for the Discover  but opted for the store card because I didnt care about their version of the Discover card. It honestly almost looks like they offer the upgrade randomly to people who would qualify for a "regular" Discover Card...

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Starting Score: TU 686 EX 641 EQ 690
Current Score: TU 779 EX 767 EQ 740
Goal Score: 800 Club
BCE $12.5K, 5/3 Sig $10K, Wally Discover 10K, Cash+ $9K Sam's Discover 10K, Freedom $6K, Zales $5.5K, More $5K, Cap one $5K, Barclay 2.5K, Household Plat $1.5K, Household Gold $1.5K, Credit One $1K, First Premier Plat $.675K First Premier Gold $.65K