The 19 is back in production; I doubt there is much demand for the 15 (if it doesn't say magnum on it no one really wants it).
The Model 66 (SS version of the Model 19) is also back in production. I saw it at the 2014 SHOT Show. Not as nicely finished as the originals, however. Generally, aside from a moderate weight saving the K-frame .357s just don't offer any real advantage over the more durable L-frame guns.
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