Big developments in Hong Kong's stock markets. From today Hong Kong's stock exchange will offer new rules to companies looking to list in the city. It's part of a plan by the bourse and authorities there to lure more new economy firms from the mainland - and already looks to be paying off big time. Sources say that Xiaomi and Ant Financial could apply for blockbuster listings as early as this week. But it's one that's happening right now that's got investors there excited. Joel Flynn reports.

It doesn't look quite like a hospital, but make no mistake - this, say some, is the future of Chinese healthcare. Ping An Good Doctor's online platform is taking the country by storm. And investors have noticed. This week the company will debut on the Hong Kong stock exchange, with reports that it's already raised $1.1 billion. Brokers have reportedly given out more than $20 billion in loans for the offering - and the hope is that the IPO could spark a deluge here.

JASON CHAN, RESEARCH MANAGER BRIGHT SMART SECURITIES "The company established four years ago and it is still loss-making - it does not make any profits. But the Hong Kong investors are still very passionate towards this company and they give them a very high valuation. I'm sure that I think this is a very important milestone for the Hong Kong IPO market and it could boost the confidence to the other tech companies."

The timing couldn't be better. Hong Kong Exchanges and Clearing, which runs the bourse, has just hired a new chairman and changed the rules for new stock listings. So-called dual class shares will now be permitted, giving different types of voting rights to shareholders. The idea is it will allow founders and owners to retain control of their companies whilst still raising money - and therefore attract more new mainland economy firms offshore.

LAURA CHA, CHAIRMAN HONG KONG EXCHANGES AND CLEARING ''We have to strengthen our core strength, which has always been there but it doesn't mean that we can stay complacent and just sit on our accomplishment in the past. So a constant quest for the better to be on the outlook and at the forefront I think is very important.''

JOEL FLYNN HONG KONG "There are still questions over governance - in particular for smaller shareholders who look likely to lose some protections as a result of these new rules. But worries about liquidity demand are over done."

Hong Kong's retail-dominated investor market typically sees margin-financing preferred over portfolio liquidation though - and analysts say banks, so far, are only too happy to loan to the brokerages offering those margins to investors. At the lower end of the scale though, there are worries about the listings market for small cap stocks, which can regularly see wild swings.

JASON CHAN, RESEARCH MANAGER BRIGHT SMART SECURITIES "The general listing rules is more relaxing and tech companies may have more incentive to come to Hong Kong, and when the previous listings could do well for the IPO, they could ask for a very high valuation, high PE and for many investors to go in, so I think it is an indicator for the other potential clients, the potential applicants, to come to Hong Kong for the IPO."

Sources here say that now this rule change has started, Xiaomi could file its initial application for a Hong Kong IPO as early as this week. Reports suggest the smartphone maker has rejigged its staff in the last few days in preparation for what could be the biggest listing in the world in 2018 - perhaps worth as much as $10 billion. That alone would be seen as a victory for Hong Kong stock exchange's new regime.