CL will not be supported to begin with, something with certificates and so on, but I did hear that eventually (at some point down the road it will be).
Regarding limitations, at this point, it is monitoring only, so you get everything that you would usually see in a Meraki solution.
Like clients, Application (if you have advantage licenses on your 9800 *auch*, that's a tough one), and you even see "realtime" radio information from the APs (no spectrum though), and the AP performance graphs.
You also see information about the WLC itself. CPU load, throughput, and so on.
There is also some eventlog information from the APs (but I don't think it really tells much at the moment).
There is no, as such, troubleshooting tools, and that is what I feel is missing the most.
At this point, still very early, it is a nice monitoring tool 🙂 - And I'm perfectly happy with that 🙂
When will it be public ? who knows.... My guess, and this is 100% me guessing with no information about anything only based on previous "experience" , if it was "launched" at this (around) Cisco Live EU, It will most likely be public at Cisco Live US, or the next Cisco Live EU 🙂