Why to report a bug, I have to be signed to closed services, like 'Pro'?
Bug reports is one of the most valuable outcomes for infotainment/telecom/IT/hightech companies, like Nokia. For field claims it is clear, there is a support team. But bug reports could be directly collected and forwarded in processing to you QA/Engineering.
This forum could be a great opportunity to collect bug reports from volunteer testers all over the world. I propose to create special form (BUG REPORTING FORM) on forum site for open bug reporting. This system could be embedded to your problems tracking system.
Definitely it can be treated by publicity, like if Nokia uses end users as beta testers, but hey, say it honestly - your recent products are really beta!