Panelized means that they’ve taken your part and combined it with other peoples’ parts to be sent off to be fab’d. They used to do this once a week, so if they’re doing it every 4 days now, that’s at least 3 days less to wait.
Hm, my order was also panelized in under 5 days (I never checked its status beforehand, so I can’t be exact). If they’re speeding up production, then that’s great.
By the way, are weekends included in the predicted production time (10-19 days)?