Hello ! nice if you are interested in Swiss !
Well, the training will be in German and in English (mostly in German) and at the beginning (during 2 years) you will fly on AVRO and A320 for "short" hauls (Europe) and then with A330 for long hauls (only if you are trilingual : German, French, English)
I wish you good luck for your selection day (in German) !!
May I ask when you've send your application form and where you're from please ?
Because someone I know from a French CCM forum send his application form on September and received an interview invitation only for January....