The usual way to become a binary options broker is to start a new company. Sometimes Forex brokers also start to offer binary options. But 24option went the opposite way, they first started as binary options broker and now they added a Forex broker.
It is called 24FX and is fully regulated by the CySec, which means that you benefit from the same security of funds as with 24option when trading binary options.
24FX uses Metatrader as its trading platform. You can trade not only Forex, but also commodities, stocks, CFDs and indices.
Only time will tell how good 24FX can be in comparison with other established Forex brokers.