"Gold noted that many of the same companies are sponsors of both the OHA and the Symbian Foundation, and some of them have stated that competing for operating system superiority is 'not where they need to be,' he said. Combining Symbian with Android would require a combination of the two code bases.
If Android and Symbian were joined, Gold said it is highly likely that other open source mobile operating system efforts will join in, such as the LiMo Foundation in London."
also see: MobileCrunch » Nokia: No plans to merge Symbian with Android
"During the Mobile Web Wars roundtable today, an audience member asked for opinions on the merger rumor. David Rivas, VP of Technology Management for S60 Software at Nokia, just so happened to be on the panel, and he stated (twice) that there were no plans to merge the two platforms."