Thanks for your questions.
The switch from issue 6 to issue 7 will take place on July 1st 2015. Audits performed before will be againts issue 6 whereas audits performed after will be against issue 7. Regarding extra cost, the audit duration might be increased but we don't know yet exactly the magnitude. Internal cost will mostly consist in performing this hazard analysis against Food fraud and implementing adequate control measures.
To become Third Party Auditor (CB auditor), you will need to receive 3 to 5 days training course delivered by Approved Training Provider (ATP). See BRC website for more details. To become internal auditor, you can also use an ATP or any other training organisation.
Food fraud can be considered as a fourth hazard on top of usual biological, chemical & physical hazards. Here the objective is not food safety but product integrity.
If some of your by-products go to animal feed, they are not considered as waste and safety of those products must be ensured.
Food fraud website can be used https://www.foodfraud.org . EU or local authorities can also provide useful information
Claims of origin could be by example fruit yogurt with apricot from Italy, Cider made of apples from Wales, burger made of Angus beef.... The manufacturing site must ensure that traceability records are maintained to prove those mentions (bill of lading, invoices, internal traceability records...)
I hope to have provided a bit of clarity and remain available for any other question.