There's a new session end screen with more info shown, even as a non-premium user. Also looks like you are awarded extra points based on how quickly you answer, which is a new addition.
Logic behind giving extra points for quick answers
The speed bonus is based on the 'error threshold'.
This is the time to answer questions after which you get most questions wrong. The danger is that by thinking very hard about an answer and getting it wrong, you can set up a false memory. So after a certain amount of time it can be better to not answer the question than to strain and get it wrong.
The speed bonus algorithm
The speed bonuses are based on the correct answers that you get within a certain % of your error threshold. So you get them when you answer correct and under the threshold, but don't get bonus points if you get the answer correct but above that time level.