The plans for digital switchover will allow the existing Freeview signals to be replaced with higher-power signals. These will be at the old analogue signal strength, less around 10dB, which means about one tenth of the power.
The improvement in signal strength for the existing Freeview transmissions is impressive. Given that concerns over poor Freeview receptions are one of your most common issues.
The higher the figure given for the predicted improvement to Freeview signals, the better.