I predict that nearly all major gun manufacturers will adopt and engineer such features into their product lines soon, anyway. We live in a world dominated by lawyers and liability. The M2 Mauser, the Bersa .380 Thunderer, and even the Browning Hi-Power already have these features, although the Hi-power can be altered. I figure even the venerable Model of 1911 can be modified. The Springfield 1911A1 already has a new barrel with a loaded chamber viewing port cut into the top of the barrel hood. These barrels are a lot better quality then those used by Springfield only five years ago. Springfield also has a new key-operated hammer/trigger locking mechanism built into the mainspring housing. That little goody can be replaced in about five minutes of less with any one of a dozen or so after market units.
How do they intend to do this with revolvers ?
Almost right. What they're really after is:
but its just one more step to the eventual banning of all guns