I'm in a similar situation. I did speak to someone at Lutron who indicated their intent is to make integrations more broadly available, not just to their partners. However, their first priority is on getting the partner integrations fully functional - so it will be a ways out. Of course, there are no guarantees. This conversation was worthy enough to lead me down the RA3 vs RA2 path.
Lately I have been mixing RA2 select and Caseta to do my bigger homes anyway. I will not consider RA3 unless Hubitat is integrated in to LEAP.
If they want our business they will have to open up the protocol or make Hubitat a partner.
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I have been hearing that Leap is a custom version of SSH with a similar interface to telnet. Does anyone have more information?
Have you seen this?
I have read this; reality is sometimes different than marketing. I am just getting updates from my Lutron supplier but I have yet to talk to anyone using it.
Access to the api docs is only for approved partners
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Hopefully Hubitat will become an "approved partner".
Or if someone passes copies of the api to him... 
The Home Assistant people are supposedly close to having their reverse engineered RadioRA 3 and HomeWorks QSX LEAP integration ready for release. Caséta LEAP is already part of Home Assistant.
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Good to know. Hubitat will follow once that info is released.
Has there been any roadmap developments to support Lutron LEAP API for Caseta? Since motion sensors were part of the Hubitat Lutron Integrator App, I didn’t think to check the supported devices list. I have bought 5 Caseta motion sensors and now realize motion support is only for the RA2 motion sensors. 
I’d love to keep these if Hubitat can expand the functionality down the road?
If Home Assistant has it up and running maybe it is worth checking out and ditching my HOOBs RPi setup?
Yea, unfortunately Lutron never exposed those Caseta motion sensors via their Telnet integration.
As you mentioned, I do believe that the latest and greatest Home Assistant Caseta integration uses Leap, and does support those Caseta motion sensors. Thus, you could get HAOS up and running, and then use the HA Device Bridge (HADB) to bring those sensors back into Hubitat if desired.
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The Hubitat staff generally don’t make roadmap-type announcements.
If it’s technically possible to accomplish over a LAN connection, then my guess would be they probably will, eventually.
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Has anyone used HA and this HA Device Bridge yet to connect radio RA3 and Hubitat? I’d be curious to know if it works I’ve also been avoiding upgrading to Radio RA3 until a formal integration is announced, but I’ve now got some devices that require me to upgrade.
I am not sure about that, as I have not seen anyone post about that particular configuration. In general, HADB does not care how the devices/entities are brought into HA. All that matters is that the type of entity is supported by HADB on the Hubitat side. Switches, Dimmers, Motion Sensors are all supported already. More complex devices, like Lutron Keypads, might be a problem - but I am not sure. You may want to post your question over in the HADB thread, as that will target the users who might know the answer to your question for certain.
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it won't, while RA3 uses LEAP, the encryption key used for the Caseta LEAP connection does not work with the RA3 bridge.
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Works fine for me.
Home Assistant talking to the Ra3 processor.
HADB in Hubitat talking to Home Assistant.
I havent done any automation in the Hubitat (already all programmed in HA for what i need) but i can turn lights on and off from the devices page in Hubitat.
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What binding in HA?
pylutron-caseta has recently added support for RA3 switches, dimmers, keypads and Picos.
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