What is the sorting criteria on answers?
I realized that the sorting of answers is not by date. Why?
The answers are sorted by their vote-count. So you'll find good answers, little faster :)
To me it seems like this is another feature request: allo sorting by other categories like timestamp or category or something else.
Will the flattr count be included as a weight? Or is it already?
Surely! It will be included. As @Akku already has answered, there will be a filter to select and a new algorithm which will contain flattr count, vote ups, timestamp and user points :)