seacon
Пробегала такая информация:

While there are at least two major Symbian-based platforms (UIQ being the other), the port will focus on S60 Third Edition (based on Symbian 9.1) and later, which includes the N95, and other Nokia, LG, and Samsung smartphones.

А также слова одного из разработчиков:

We will start out by using S60 3rd Edition FP2 v1.1, but it shouldn’t be hard to move to a newer version afterwards.