The answer is both "yes", and "no", and this was brought up a couple weeks ago in this forum (I don't freshener if it was this, or another, thread). I know this might sound strange, as several of us in here already think it is - if you're using an iOS device, then v1.3.2 (if I remember correctly) is the most recent firmware...but, if you're using an Android tablet, several of us (myself included) received notices approximately 1-2 weeks ago that a transmitter-only firmware v1.4.xx (I no longer remember the exact version number) was available to download/install, directly through the DJI Go app. The strangest party of this was that, while it stated "v1.4.xx" before installing/downloading, after the download/install was complete, the transmitter showed this as the current firmware version number:
1.3.2+
The question most of us were asking was, "What's the + stand for?" Of course, we never got an answer. But, as you can see, if you're using an Android tablet, then, technically-speaking, yes, there is sorta-kinda a firmware v1.4.xx...sorta-kinda.