The latest trend (I believe it is mentioned in Unit 1) is for the pupils to be informed about their classmates' situation (with their consent of course). This can be done in a sincere and simplified way and research has shown that pupils can be extremely understanding and cooperative when they are aware of the situation.
As far as your comment about additional knowledge and/or practice for teaching learners with SPLDs well, this can't be more true. In fact for those of us who graduated ages ago this is the case for the mainstream classes as well. Hopefully, through this course, we will gain insight to dyslexia in relation to foreign language teaching and after these ten weeks we'll be feeling a little more confident!