PS: I am interested in making an objective Wiki page about this subject with all the pros and cons outlined. The idea is to devide in 3 parts: 1) small changes (e.g. a bug or feature previously in a NIT) 2) big changes (ie. things Nokia would use in a marketing announcement) 3) research / expensive changes (like e.g. solar power, totally different hardware platform, and so on). What more should I keep in mind before I start?