I never noticed the artwork being uploaded so thanks. The last beta it did all of that overnight so I never saw it. On the bright side they added a new data field called "icloud status" so we can actually see what got matched.
So far I have seen the following:
Matched
Waiting
Purchased
Waiting
Error
Removed
Not Eligible
Guessing Uploaded will be there once I get there (again)
Uploaded is an status. You can create a smart playlist for iCloud status with Matched, Purchased, Uploaded, or Ineligible as the options. Quite nifty for seeing just what was uploaded. Turns out I have about 300 out of 2300 that were uploaded, and looking now, I realize a large chunk of them are live albums or obscure bootleg type situations. Still running into that strange problem where a whole album with match except for one or two tracks