As reported by engadget,
If you’re the slightest bit interested in grabbing a new phone, it seems there’s little downside in providing your details while we wait for Samsung to reveal what it has up its sleeve. You’re not obliged to buy an S21 if you do. However, Samsung says reservations will end soon, so you’ll need to decide quickly if you want to lock in a preorder slot.
While Samsung has yet to confirm an S21 event for January, a number of leaks and rumors have hinted at what’s in store. There could be an Ultra model with S Pen support and a Note 20 Ultra-style LTPO display. The lineup will at last support 4K, 60 frames per second video capture, according to rumors. Leaked images have also provided a look at the color options and updated rear camera array.