It's the same announcement as last year (or maybe earlier this year), when £53m was also quoted, along with increasing the number of platforms at the station.
There's a bit of info about it all on the Gatwick Airport website. Here's some.....
The Government’s funding commitment follows a letter from the Independent Chair of the Airports Commission Sir Howard Davies to the Chancellor, which recognises Gatwick’s success in increasing the number of long haul destinations served, and includes a series of recommendations on improving surface access to enable passengers to more effectively access new and existing routes.
..... and the rest
Gatwick Media Centre
Apparently, Gatwick's recent growth has been recognised. I may be reading between the lines, but I'm starting to think that the airport may actually make it to the shortlist when the Davies Commission eventually reports.
Airlift