The Daily Mail has a long article with several of the pictures:

"Experts have already examined the 1,345 items but another 56 clods of earth have been X-rayed and are known to hold more metal artefacts, meaning the figure is likely to rise to around 1,500.

At least 650 are gold, weighing more than than 5kg, and another 530 are silver, weighing around 1kg. This is far bigger than previous finds - including the Sutton Hoo burial site in Suffolk."

The original finder dug around for five days and then finally realized it was too much for him, and worried about "night hawkers", the metal detector folks who don't report their finds. They've had archaeologists on the job (in secret) in the intervening months, and now the field is grassed over.