Of the three habenero, two survived. They were dormant all Winter. They sent out new sprouts through the soil from the roots but nothing came from the old stems from last year. They're doing very well.
Both of the serrano survived. They put out a few small leaves from the original stems early in the Winter but those didn't grow much at all until Spring.
All four surviving plants are out in the cold frame at the moment and will be replanted in the pepper bed before too long. If they do anything out of the ordinary this year, I'll post it here.