Today the Symbian foundation officially made Symbian OS open source 4 months ahead of schedule
http://news.bbc.co.uk/1/hi/technology/8496263.stm
you can find the code here
they also revealed that Symbian OS will in the future run on more than just mobile phones and we will see it on tablets and more
I'm looking forward to Symbian^3 and especially what Symbian^4 as to offer in 12 months time.
The UI concepts look a lot like Maemo 5 but lets wait and see.