That's a lot of could's..
It's a new uArc yes, so it gains a few things and looses a few things.. Kind of a rebalancing act for AMD as they need to make the most out of die space.. I am pretty sure this is a 256mm^2 chip and that fits perfectly into that 44-48 CU bracket. 40CU setup sounds good, but i think that's a bit less for a chip that's competing against a RTX2070, IMO.
Acc. to Videocardz, the two chips are 180 and 225 Watts respectively. Also, all the Navi preview cards showcased so far have 2 8-Pin PCIe connectors

Appears the chips are running at their maximum possible Clocks as a lot is riding on the first "Navi" GPU.. Can't be slower than the competition, right.. However, most can simply tweak them for power savings in Wattman, if required.
Even then, these are only sipping 20-40 Watts more than their counterparts, which is a LOT better than 100+ Watts more, as was with Polaris/Vega.. (having no compute / RT HW helps..)
Based on their track record, and that Sapphire Reps statement; I am pretty sure the lower SKU beats Rtx2060 convincingly. But, the faster part, that AMD demoed, most likely trades blows with Rtx2070 & leads only in games AMD has generally better performance. Would like nothing better than to be proven wrong though..