Of course Nasim is returning. With Wiig gone and now Abby leaving, nothing could pry Nasim away from SNL short of the Spanish Inquisition.
As to Kate, when was the last time they cut someone loose after a short tryout? Fred Wolf? Even Jerry Minor and Riggle got full seasons.
I don't see why you're so worried, Potato. The intent of adding Kate to the cast late last year, as opposed to the beginning of Year 38, was to ease the transition.
Also Ruck, don't forget Morwenna Banks.