addendum
i had a look back at SQF 7.2 Lvl3 and the SQF8 Food Quality Code. Seems the principal relevant changes for this thread are in the new 2.4.4.2 - 2.4.4.4, namely -
.2) Material suppliers shall be selected and approved based on their ability to supply materials that meet quality specifications. The evaluation program shall require suppliers to:
i. Maintain controlled and current copies of specifications;
ii. Have processes that are capable of consistently supplying materials that meet specification and other defined quality metrics (e.g. delivery. service, adherence to specifications, etc.);
iii. Be certified to a second or third party quality management system; and
iv. Have a complaints and corrective action process in place.
.3) Material suppliers shall only be accepted into the facility based on either certificates of analysis for every lot received, or inspection at receipt to ensure materials comply with specification.
.4) The approved supplier program shall include an agreement with suppliers for the return or disposal of materials that fail to meet specifications or are damaged or contaminated.
(the red are items which i guessed might have a more immediate impact).
Some of the above changes are reflected in appropriate additions to the Audit Guidance (AG) list for sqf7.2 although ca 90% of the sqf8 AG looks almost identical to me.
Seems to me the net changes for this supplier approval topic maybe not so much in SQF8 except perhaps for 2.4.4.2(i,iii) although SQF users may disagree of course.
Regarding yr query on "audit" I noted from some comments in sqf 7.2 threads that, at that time, a checklist based on the SQF Code was "expected" (although seemingly not mandated anywhere and seems a rather Draconian choice). The new chunk regarding certifying to a "quality management system" might be "problematic" for some raw material/ingredient suppliers(?). Fishing Boats ?
I anticipate current SQF8 users will have a much better idea than i regarding the above. Comments are obviously welcome. 
PS - for sqf 7-2 I noticed a suggested vendor excel here -
http://www.ifsqn.com...ers/#entry87307
As a caveat to clarity, can also see the potential confusion (mine) on this topic here -
http://www.ifsqn.com...-vendor-audits/
(a) Does the lack of a definition allow the supplier to create their own quality certification? (b) Would on-going product inspection supersede the need for a certification
(a) Maybe Yes but (see comments above)......(b) Seemingly in Principle NO but effectively perhaps depending on what kind of input/supplier is involved.