Do we really have to worry about the development of Raring (and the 13.10), when it would have it end of life in October 2014? Or should we concentrate on Precise, which would live until April 2017? Or await 14.04 LTS, which would arrive in April 2014?

Quantal, Raring and 13.10 would be transitional releases, to try out the eventual bugs and the users. Like Natty, Raring would die away in the next 10 months.