newRPL: [UPDATED April 27-2017] Firmware for testing available for download

[JDW]

I only found this thread today, and I must admit I only read the first 3 pages. Please be merciful to me for asking this most basic of all questions but here it goes...

What is wrong with the old RPL such that a newRPL is needed?

In other words, what are the easily noticeable benefits to newRPL for the average HP 50g calculator user? Is it just an expansion of RPL for programmers? Or does it provide UI enhancements that benefit non-programmers? Is there a video overview of newRPL that explains the highlights so no flashing-and-fiddling is required?