Got an email back from Brian Bero...
"Hey Tom,
Thanks for the interest in the Dexter knives for season seven.
We just finished filming the last episode of the season yesterday.
We have five new custom knives, new style bone saws and a pick added to the kit this season... as we got rid of the "store bought" knives.
The new pieces are added thru out the season for specific episodes.
Sorry, but I cant post photos of any of the new pieces until they air in their respective episodes.
Unfortunately I can't sell any knives or copies to the general public at this time.
Sorry I can't be of more help...
Hope you enjoy season 7..."