From 30/4 to 60/4 Mbps speed increase, no specific set date on when it will happen other then sometime after the all-digital transition is complete.
Some of the other East areas began the transition on Sept 9th, while others are later such as your market. Other parts of the state (West and parts of Middle) transitioned even earlier.
Some other recent threads you may want to read through:
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East, TN spectrum upgrade?»
Knoxville, TN going digital Sept. 9