Sorry, no rook rifle, at least not yet.
There MAY be (and do not quote me or consider this as a guaranteed "will be") the possibility of a rimfire single-shot somewhere down the road, but nothing yet.
The guns are not yet in production.
They are just now going into the new catalog for 2017.
In steel you're looking at .223, .243, .308, .44 Mag, and .45-70.
In brass it'll be .44 Mag and .45-70.
Steel weights will be 7.18 pounds in .223, 7.10 pounds in .243, 6.94 pounds in .308, 6.96 pounds in .44 Mag, 6.83 pounds in .45-70.
Brass weights will be 6.96 pounds in .44 Mag, 6.83 pounds in .45-70.
Those are the latest weights I have.
I doubt there'd be sufficient demand for a centerfire below the .357 for Henry to bother with.
A single-shot .22LR or Magnum might have appeal, but some people are already beginning to gripe about the idea of paying more than Handi-Rifle prices on a single-shot, so a rimfire built to Henry quality might price itself above the market.
Denis