What happened between 39gii and prime?

[Pjwum]

Just ask Wikipedia:

"Development of a "HP 39gII+", an improved variant of the calculator powerful enough to include a CAS, was almost finished when the underlying processor was abandoned by Freescale, causing the project to be abandoned as well.[3][4] Instead, the calculator concept was revised again and the specs further improved (f.e. color touchscreen, even more powerful processor), which eventually led to the release of the HP Prime in 2013."

If I remember correctly there is an old forum thread where Tim Wessmann states that sales numbers also weren't great because of the lack of a colour screen.