Thanks to Alienware for the heads up.
@drovethrughosts No mistake! 10 big, big episodes!
— Peter Gould (@petergould) November 15, 2015
It was previously announced to be 13 episodes, "AMC confirmed it has already ordered a second season of 13 Better Call Saul episodes, for an initial total of 23", which you can find here.
Season 2 of Better Call Saul will now consist of 10 episodes
Source: AMC