Originally posted by thibs
If they needed to change an important part, they had no choice. Simple as that.
EDIT: But I'd have chose something like K75 if it was me.
Sony disagrees. The numbered code changed to ILCE-A7M3_A or something like that but the cameras that got changed (the only customer-noticeable change was also an increase in the resolution of the screen, coincidentally) are marketed the same exact way they were. You have to look at the sticker underneath to see any difference. It's strange that Pentax would be forced to change the name on the badge, considering cars do that every year and don't change branding...
I suppose Pentax either wants to make a new numbered system (KFii, KFiii ,etc.) for entry-level, leaving the well-established K-3 and K-1 as flagships... or they want to make it clear this is an interim model. "KF" is certainly not what I'd have gone with, but it's what it is.