Roku's recycling of product names makes it really hard to provide a recommendation to novices.
When someone advocating to get a specific 7th generation Roku product needs to also specify to make sure it isn't the 2016 models or to avoid model 4620/4630 then there is just all sorts of needless confusion.
It's not at all clear to me on the product page whether the new Premiere+ has a non-IR remote for the Roku control? It just says "Voice remote with TV power & volume" where as the old P+ page said "Advanced point-anywhere remote with headphone jack for private listening."
Obviously it must send IR to control the TV power and volume. But is it wifi for the Roku Premiere+ box itself? (I like to hide mine behind the TV or whatever the TV is sitting on and hence non-IR Roku control is a must).
Can anyone confirm with certainty?
I agree that 5 GHz is preferable for wireless connections, but it isn't a requirement for the device to be 802.11 AC. Roku has had dual band wireless all the way back in a few of their first generation boxes (these new players will be 7th generation). Even with what you can buy today, the Streaming Stick, Stick + and Ultra are all dual band players, and those happen to support AC as well. But my 4th generation Stick (4th generation, model 3600) is dual band but only on N, and even older devices that are still in use have dual band N radios (Roku 2 & 3). Even some older ones do, but not too many of them left still in use.
And 802.11N is still capable of speeds in excess of Fast Ethernet (100 BaseT). Even the slowest routers are 150 Mbps, while the faster ones are up to 300 Mbps. More than enough for online streaming, and even good enough for local UHD content that isn't compressed.