I wouldn't say we should get our hopes up, but again this is a "possibly" straight from Nvidia's official Twitter page, so who knows!
Original post (About Android TV Shield)
Nvidia Shield Tablet info (Found in replies to above tweet)
Original Tweet: https://twitter.com/nvidiashield/sta...31937076629504
So yeah, @NvidiaShield directly replied that we could "possibly " (note the smiley face haha) get 6.0. But who knows, after the recall and all I wouldn't be surprised if Nvidia stopped caring about our Tablet.