Yep, the board is a new addition. A while ago some fibreboard mock-up LED boards appeared on the third side of the triangular structure on the top of the information point.
One was a 'next train to' A-Z, and the other was a standard departure board design.
The mock-ups have now been replaced with an orange LED A-Z board, meaning all three sides finally have something on them.
The new board solves the capacity problem of the old blue board and can display an entire list of destinations at once.
I approve, personally - you look for where you're going in the list (multiples exist for popular destinations; this also fills space), it gives you a platform, and that's that.
The folks on SSC seem to be assuming that the blue boards will be replaced but nobody knows, and Network Rail haven't mentioned anything.
Personally I don't understand why a traditional departure board can't be installed above the gateline instead of advertising (as is customary?), or somewhere else. Then again it remains to be seen what Network Rail will install instead of the blue things, if anything - for all anyone knows the remaining sides might get replaced with something different such as a departure board.
The new side has six panels of 'next train to' with columns for destination, scheduled time, expected time in white (only if there's a delay, otherwise this is blank), platform, and operator. Unlike the old board, this one doesn't tell you the end destination of the train you want.
To the right of those is a clock/special announcement panel, and right again is a short form departures list (time, destination, platform, expected time).
The new boards on 13/14 are slightly older I think - they're a little smaller, but convey the information about trains a lot better - they now explicitly say '2nd' '3rd' etc on the second line of the board, for one.
