For probably the majority of wireless devices you won't see any improvement, because they may already be operating at the maximum real-world speed given their specifications. Some high spec devices will be able to operate close to or even above 500 Mbps, but they are a small minority.
In terms of the question "has my cable connection speed been upgraded?", connect to the hub, click on Check router status, and then on the Configuration tab. Look for the field for Maximum Traffic Rate in the Downstream section. That'll show your connection speed in bits (not mega bits) per second. Knock off the last six digits and you should see a number above 500. If you're seeing something like 221, then the configuration upgrade hasn't yet been sent to the hub.
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