once the ICO is over, the TOKEN is swapped 1:1 with SuperNET asset
At that point it is freely tradeable with symbol UNITY or you can withdraw the asset to your NXT acct and trade it on the NXT AE
Now the NXT TOKEN asset would be transferrable as it is a normal NXT asset. At the end of the ICO, a 1:1 dividend will be sent to assetholders as of the end of the ICO. After that, the TOKEN asset would only have collectors value as it wont be entitled to any dividends or anything at all. basically it becomes an unbacked crypto with no dev.
Think of the TOKEN as the wrapping that SuperNET comes in.
The NXT has a transfer asset command and you just deposit to an exchange by sending it to your deposit address at the exchange. The withdraw works in reverse and you send it from the exchange acct to your NXT addr
James