I have some scepticism about what this guy says, but I'm sharing this anyway. It's a blog post from Kimio Tanaka in which he implies that some aspects of the FF mock up were deliberately deceptive.
Japanese
Photo of the Day PENTAX ???????????????
Google translate into English (very difficult to understand because of the conversational style of the bog post)
Google Translate
Some key points:
- There may not be a built-in flash
- The back LCD may be movable
- Pixel shift resultion enhancement may come in a model before the FF
- SR is likely to be included with all the normal functions
As I say, I have some scepticism about this guy. He is a bit of an attention seeker. But he was also featured on Ricoh's stage at CP+, so I believe he has some genuine insight. Make of it what you will.
---------- Post added 03-22-15 at 11:16 PM ----------
Actually, this summary of the same article is easier to understand in translation.
Google Translate