Based on the team X account's hyping of Mis today and Hogg's recent comments, I am now 99.9% certain the pitcher call-up is going to be him. Yoho would be great, but last night's outing, as uncharacteristic as it was for him, probably didn't do him any favors. Nevertheless, he's only one Wilson/Ross DFA or injury away.
Position player is more up in the air imo. Black homered last night, but still doesn't look like he's ready to translate to the majors with his poor QOC metrics. I think given he's already been called up by the team multiple times including just recently you'd have to consider him the favorite. Hicklen is certainly in the running as he's likewise on the 40 man. You'd feel less guilty about taking away regular playing time from him than you would Black, and he could fill a RHH 5th Ofer need. On the flip side of the coin, Hicklen has been ice cold in August and actually hits RHP much better than LHP.
Only other position players on the 40 man are an injured Quero, Yelich, and Dunn and then Capra. Capra is pretty redundant with Monasterio, however.
So my best guess is Mis and Black.