I gotta say that OP has a point. You look at the firmware release schedule, and this has been a long time. My trigger finger is anxious for some updates. But, that said, I'd rather wait a little longer than have software filled with bugs.
You mention companies are forthright about upcoming releases though? Okay. Well, when Microsoft announces a new version of their OS, or Apple does the same, it's still months off, but the major version bump happens, at most, once a year. The reason they announce things is for marketing hype and to get users excited. However, there are two BIG differences between an OS X release and a Kemper release - device compatibility and competition.
Device Compatibility - The Kemper has to perform on one platform. One type of hardware. One display. One keyboard (think of the front panel buttons as a keyboard). The I/O is identical, save for the power amp option. When OS X announces a new release, they are in the beta testing phase. Their product is complete, but they have hundreds of different computer configurations that could be buggy. Windows is more of the same, except instead of hundreds, there are more like tens of thousands.
Competition - Kemper doesn't have direct competition. One could see AxeFX as a competitor, but they're really in a different league. The features Kemper needs to add on don't really apply to the AxeFX.
So with no direct competition, and one device to support, there's no reason to open up the upcoming release schedule. For a company like Kemper, that's like saying "our developers plan on being done by this date," instead of Apple saying "our product is done, but we want to test it out for a couple months and make sure it's solid." Saying "a new firmware version is coming out in 3 weeks" sets a firm deadline that most people anticipate and expect. People get unnecessarily excited for the new "thing," because, now, all of a sudden "old thing" wasn't good enough, even though you've been using "old thing" for a long time. You have unhappy users if it's late (programming is HARD, and you can't always foresee a problem), and you set a precedence for releasing updates early if you do it even once.
The fact is we haven't gotten any firmware updates because the Kemper is relatively stable. There aren't issues. And that's a good thing.
Would I like to see a release schedule or a list of upcoming features? Sure. But Kemper is no Microsoft. Or Apple. Or, heck, Marshall (even though it can sound like their entire historical archives). Releasing that information is just going to create an entirely different channel of user happiness that they'll have to manage.