Why no 1-5 boxset? (There was never a 1-4 boxset for that matter).
Paramount don't have rights to Scream 4
Paramount don't have distribution rights to any dimensions made after October 1st 2005
All dimensions films made since October 1, 2005 are currently owned by Lantern Entertainment and Lionsgate via
Spyglass Media Group.
Scream 4 is a 2011 film
If you want Scream 4 get a 4K UHD release you will have to wait for a release from Lionsgate via Spyglass Media Group
Previous home media releases that included scream1/2/3/4 in a box set was not a release distributed by paramount
Paramount done a recent blu-ray box set for Scream 1/2/3 in 2020 as they have the rights to do that release but could not include Scream 4
Paramount only have home media distribution rights to Scream 1/2/3 and Scream 2022
Scream 2022 is Spyglass Media Group production but distributed by paramount that is why home media release for scream 2022 is with paramount