Nice overview, thanks man!
Qtum first traded as IOU token only on listed exchanges that participated on the crowdsale - since 1-2 weeks, QTUM-Team decided to build an ERC20 token, still IOU on Ethereum. Once the mainnet launches in September, the ERC20 tokens get transferred to real Qtum-Tokens on the Qtum-Blockchain.

So, Qtum is a new Blockchain (launch Sept 2017), with UTXO, EVM and an account abstraction layer - it will not (yet?) talk to Bitcoin or Ethereum chains.

I think Qtum, along with Tezos, EOS.io, IOTA, impose great potential as each of them introduce a new high scalable infrastructure for real business integration. Qtum seems to be HUGE in asia and wechat/jaxx/other integration is being worked on right now. This means real dApp development is already on-going, this is exceptional.

This is not an investment advise - I simply consider qtum for some business integration and had some closer looks also on the github - it's real!