DA 12-28mm on the way?

Tokina isn't owned by Hoya, at least not as a subsidiary would be. Hoya has a few shares in Tokina, but they don't hold the majority (or even much) of these, and as such, are only a marginal shareholder of the company.

Tokina is, however, distributing Hoya photo products (essentially, filters) in the world, as stated in the link below (check the last phrase under "Hoya"):

http://www.thkphoto.com/company/parent/

For instance, Hoya, Tokina, Kenko and Slik are distributed by THK (Tokina-Hoya-Kenko) in the U.S., just like Daymen is distributing Hoya filters, Silk tripods and Tokina lenses in Canada.

But Daymen is also distributing products like Sekonic and Lensbaby. That doesn't mean Sekonic is owned by Hoya, just as it doesn't mean Tokina is owned by Hoya either. They only share the same distributor, hence the common mistake about the ownership of Tokina.

(Some companies can find interest in joining forces to distribute their products together, especially smaller companies, like Tokina Lenses Inc. and Hoya Filters Inc., as it helps reducing the distribution costs.)

Of course, none of this makes Pentax more likely to have any reason to release a lens similar to Tokina's coming 12-28mm F/4. Unless the Pentax-Tokina collaboration has been renewed. Or unless it wasn't stopped at all in the first place, but was just put on hold for some time instead.

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If photography can be considered like painting, then I'm still at the preschool "paint with your fingers" level.