Assuming this is the replacement for the shield handheld, which isn't certain yet (there is a chance that they will launch the handheld with the 64 bit K1 later I suppose or even now still with 32bit K1). Assuming though that it is a replacement, this would be my feelings on the situation:
The current Shield handheld is a portable gaming device that allows you to play games using a controller on the go.
This is a tablet that combined with that controller does not allow you to play controller games on the go.
Result: Everyone that bought the original shield for mobile controller based gaming is now removed from the pool who would buy this. In fact does it even make sense to game on this at home, not exactly ideal to have to prop the tablet and have to play with a controller, limits the positions you can do this. Certainly not lying flat on the coach.
Price, as a gaming device only. The price is prohibitive to many. $359 if you don't already have a controller is a tough swallow. Many had panned the Shields high price until it dropped down to its current range of pricing. This would be even worse. OF course if you need a tablet also, its not a bad price proposition. But for gamers only , its a tough one - it's very near a PS4 price, and really doesn't offer much portability to distinguish it.
On a side note, this isn't going to attract many devs to build controller based games for it. As a dev, you would not design a controller based game for a standard tablet that does not come standard with a controller like the original shield did. This is also a sticking point for it to be seen seriously as a controller based gaming device in devs eyes.
Would have been much better if they actually thought about use cases and released it with an attachable controller like Wikipads one, or the expandable bigben game grip.
As a tablet though, it looks good, maybe $50 to much, but I see they have gone for a more premium build this time over the Note 7 , so that explains the price some what. Disappointing that there is no ac wifi though.
But to be frank, this is really just a launch of a decent tablet. Putting Shield on it , does not change that into something else.