F-Secure will detect the malware according to their blog post: http://www.f-secure.com/weblog/archives/00002249.html
http://www.f-secure.com/virus-info/bdtp.shtml
"F-Secure Corporation would like to make known that we will not leave such backdoors to our F-Secure Anti-Virus products, regardless of the source of such tools. We have to draw a line with every sample we get regarding whether to detect it or not. This decision-making is influenced only by technical factors, and nothing else, but within the applicable laws and regulations, in our case meaning EU laws."
So they won't leave explicit backdoors in their software, but their decision on whether or not to detect a particular malware is influenced by EU law.
Transparency is a top priority, otherwise we're approaching a high-tech East Germany. The group I least trust snooping on the world is the government (ie, above the law).