FWIW: you can run vSphere Web Client 6.0 without NPAPI in Chrome, and use the HTML console to interact with the console screen. The big hangup is when you try to upload (or download) files into datastore, where you'll find things won't work at all. They also have the VMRC console, but on the Mac at least, that is a bit rough, but a bit more functional than the HTML5 console in 6.0
The most promising job for this fling is to control the host when vCenter is down (ie. to bring vCenter back up if you don't have a totally separate management cluster) without having to fall back to vSphere Thick Client. It is also light weight, only 2M! Quite a different direction than the VMWare Host Client that only existed in the first 6.0 Beta.
I think it is also a proof of concept that they don't need to use Flash and NPAPI to get the job done, hopefully pushing the vSphere Web Client team that direction before its too late and Flash and NPAPI are both banished from all browsers.