Last time we got an update from iBasso about the API being released IIRC was when I emailed them a long email stating the communities interest in better firmware. I listed the amount of members on here who would be willing to contribute financially if it meant a better firmware was released in the long term. The result was some new information and figgie got a free DX100.
iBasso is a small company. If everyone who posts questions about when the API is being released, etc, would instead send them an email I'm sure the sudden increase of emails about the subject would bring it to the forefront of their attention, hopefully bring about some positive change in the right direction.
Whilst 1.4.2 is better than the previous firmwares (in terms of responsiveness and bugs) it's still unacceptably slow, susceptible to freezing if you don't wait 10+ minutes for it to load and buggy. We still deserve a better firmware so again, everyone email iBasso (doesn't have to be long but it helps if it is) about it and maybe they'll hurry up and release a decent firmware and additional information about the API situation.
The email is: service@ibasso.com