Several sites are running the story that Nokia is developing a Linux-based OS called Meltemi to replace S40 on feature phones.
http://online.wsj.com/article/SB10001424052970203405504576599011587667984.html
http://blog.gsmarena.com/linux-based-meltemi-could-be-replacing-s40-for-nokias-low-end-phones/
The story fits in with the statement from Nokia, that Qt will be core to "bringing applications to the next billions users"... even though S40 doesn't run Qt, Symbian supports Qt, but is being phased out and the N9 would be the first and last Nokia Meego phone.
http://www.allaboutsymbian.com/news/item/13025_Nokia_Connection_N9_MeeGo_Harm.php
http://www.developer.nokia.com/Community/Blogs/blog/nokia-developer-news/2011/06/21/future-of-qt-bringing-apps-to-next-billion
People have thought this would mean that Qt support would be added to the S40 platform, but that is certainly not the only option. There is a Nokia world conference coming in London, October 2011, so I would expect people to be asking Nokia about Meltemi and their previous "connecting the next billion" statements.