In my store, there have been seasonals that have been given presentation shifts after Christmas and still not kept on.
Presentation is really busy after Christmas and they probably need people to work the shifts.
If you are scheduled, show up, work your shift, and collect your pay. If you want to stay permanently, tell HR, tell the store director, tell your ETL, and tell your TL.
Most stores tell seasonals after Christmas but before the next schedule (early January) is posted. That way they do not quit and stop showing up before Christmas when the store needs everyone they can get to pick orders, put out stock, and run registers.
If you are not kept, work every shift you have been scheduled for. If you don't you will be not rehireable in the future. Also, if they do not want to keep you, make sure they pay you for everything you are scheduled. Don't give them back any money by not showing up.