They told us in the last conference call. Symbol to change on 3/26 and it happened. They explained about the app on the call so I expect it is coming since they deliver on what they say.
The app does not launch because the symbol changes, it is launched because and when it's ready. It's an app that's supposed to cover 40 countries (listed here https://www.humblpay.com/mobile-pay-page), covering consumers, freelancers, consumers, taking into accounts a huge number of aspects required in payment transactions like sharing payment, tipping, refunding, ...etc. And considering the differences that may exist from one country to another.
And it's not only the app on the mobile phones, it's also the backend and infrastructure that services it. It must be powerful enough to serve a huge number of users per second, scalable to meet growing demand if needed and shrink when less to reduce cost, reliable and running stable with no interruption, secure enough to operate in such sensitive domain where the users entrust the company with their financial data and may connect it to 3rd-party services.
The last thing I want to see is the management releasing the app prematurely to please traders and impatient investors only to have the company image and trust ruined for a downtime or security preach. If it takes takes months more to launch I'd give them four to make sure things are OK.
Brian did that already in the last CC. His role is managing the company, not the stock price.