This is not another IPO. It is unborn-coin inside another coin with trading possibility.
What, like a derivative?
There will be a real exchange in a few weeks after the IPO is closed.
It might be interesting. Let's say 200 BTC were invested. You release Sim asset on Nxt AE. 1 token for every 0.1 BTC invested, it means that 1 token represents 200'000 SIM (if I did the math right). So you release 2000 tokens and distribute them among investors. For instance, I invested 3.5 BTC, so I'm getting 35 tokens which represent 7'000'000 SIM. After you send tokens we're able to buy/sell them on AE. After you launch the coin asset owners send you tokens and get real coins for them.
Why would you do that?
1. Get some publicity before the launch. Lots new people will know about Sim after it goes to AE.
2. Trading would start long before the launch and the price would be growing with time. As closer the launch as higher the price.
3. Some people not just would know about Sim but into it before it even launched.
4. Just for lulz