Preview on iPad

tldr: no

Apple does not pre-announce its plans. None of your

fellow users in this forum have access to such information.

You will have to wait and see what is included in iPadOS 16 when it

is released in the fall.

While preview does not exist as a standalone app in iOS/iPadOS, the mobile OS has a variant of it built in, allowing you to view files of all types without having to download something else.