Kanex adapter?

So good news according to facebook the thunderbolt to usb 3.0 adapter is coming soon q2 this year. Under 100 they said. And cheaper than any hub on the market. Plus I don't need a full hub anyway. Just usb basically.

Anyhow so how does this work. Thunderbolt is 10bg and usb 3 is 5gb per second. So it will just go 5gb per second? Or an adapter is not capable of ull speed? And if I get a hub can I still get 5gb each (5+5=10) or it is limited to 5gb because of the port? And then therefore it will be 5gb devided by 4 ports? Or if I'm only using 2 of the four ports 5/2 and the other 2 ports stay unused?

 

I assumed I was limited to the usb port and not the other side. Or maybe I can convert the esata port to usb3.0 with some kind of adapter like the newertech one. I'm probably limited to that speed although newertech claims it can make things faster. They should of made options for online ordering only with 2 usb ports or other options incase anyone wanted one but they didn't. They wen't with the general public. So Or I can split it with a hub but I was just not sure how that worked. If it was share with all ports or only the devices I connect. Because Otherwise I only need a 2 port hub and not 4 if its wasting the bandwidth even without anything connected. And strictly 2 ports only is hard to find. If not and its like g4cube said only what I have connected is sharing the 5gb then it doesn't matter. But was not sure so I wanted to double check.