Well Gurren Laggan and Rosario+Vampire did it with their products, I guess K-on will indeed go with 2 focus characters while there will more figures of female lead with the others.
So I expect 2 more Ritsu and Azusa with Yui or probably since Mio is popular they'd do a Mio/Ritsu and Mio/Asuza.
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Vampire+Sisters
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