According to Microsoft’s currently published plans, new versions of drivers (including Minifilters) will not be loadable on Win 7, Win 8, or Win 8.1 unless those drivers pass HLK/WHQL.
See the post in NTDEV on this topic here.
And for more information see the OSR Developer Blog post on this issue here.
This is a VERY SERIOUS issue, folks. I only WISH I was exaggerating.
Peter