Here is a first response from Logitech support regarding the problem with the Pro 12.2 with 5.0.2 and the Logitech Pro folio keyboard.
"Dear Bruce E,
Thank you for contacting Logitech Customer Care.
We already have confirmed that this Logitech PRO for NotePRO 12.2 and TabPRO 12.2 is having an issue with the new version of the android OS which is the lollipop [5.0.2], we are still waiting for the resolution that our escalation team will obtained from the investigations that they are doing as of now. We will notify once we have the resolution of the problem.
To contact us by phone or obtain additional information (FAQ's, Forum, Manuals, etc.) please visit support.logitech.com
Best regards,
Logitech Customer Care"
Clearly, Logitech recognizes the issue and is working to address it. So it seems that Samsung has not altered the OS to increase keyboard sales.
THANK YOU for this. Here is my update:
I went into the Samsung store within my local Best Buy. The technician was completely unaware of this issue. Here is what he did, with (results):
1. Flashed the update via USB from his laptop (FAIL)
2. Did a factory reset via USB from his laptop (FAIL)
3. Paired the keyboard and a generic mouse I have to the Note Pro 12.2 (SUCCESS)
4. Attempted to use both keyboard and mouse (FAIL)
5. Paired the keyboard and mouse to his Note 3 (running 5.0) (SUCCESS)
6. Attempted to use both keyboard and mouse on his Note 3 (SUCCESS)
7. Called his own tech support--they had no other troubleshooting ideas for him, and had not heard of the issue (FAIL)
8. Paired and used my keyboard with a display Note Pro 12.2 running Android 4.4.2 (SUCCESS)
9. Paired a display keyboard the Note Pro 12.2 (SUCCESS)
10. Attempted to use keyboard (FAIL)
His manager came over at this point and discussed options with him. My keyboard is too old to be returnable to Best Buy, so they told me I'm SOL. I informed them that I had been watching this forum thread, and that a number of Bluetooth devices (keyboards, mice, music pedals, etc.) were failing to work on the 12.2 AFTER the 5.0.2 update. They looked at each other, and he looked sick, stating that he had flash updated several 12.2s that he had sold in the last couple of days. I asked him if he could flash me back to 4.4.2--he couldn't.
I'm waiting to hear what happens with Logitech, in the meantime I'll try to find 4.4.2 online and attempt to flash it via Odin, but I'm not very hopeful. Last ditch effort will be to move on to the Nexus line.