Why is Proline discontinuing numerous wheels and tires for the Promoto?

I recently purchased a Promoto MX (took advantage of father’s day sale). While browsing some wheels and tires, I noticed some insane discounts for their aluminum V2 bead wheels. Looks like they are just clearing out a bunch of their remaining promoto stock. Are they coming out with new lines or are we going to be out tires options from proline?