SMPhoto, are you sure the Citigroup report is accurate? I find it strange that Pentax would announce their future EVIL plans only to them (while nothing is publicly known about cameras which will be released next month).
Plenty of EVILs? There is m4/3, of course. Then, Samsung - I doubt Pentax would join them. And NEX. Sony's NEX. "Everything proprietary&as closed as it gets" Sony's NEX. Not that many systems, actually - though, I fail to see why Pentax would join any of them (abandoning us).
What Pentax is working on? We'll see next year... but I'll remind you that Pentax is the inventor of the Japanese SLR
IMO, any K-mount, 645 or even 67 DSLR would fit better than those mirrorless thingies.
Aristophanes: "The statement neither confirms nor denies." - IMO this is the logical conclusion. And the only thing Pentax can do, right now.
They can't replicate the m4/3's success; too late for that (not sure if they had resources for such a bold move, anyway). IMO for now they can stay with the still dominant DSLRs, growing their market share, their brand recognition - and of course carefully observing the market, being ready to make this step when necessary.
Rangefinders, unfortunately, are a thing of the past (while they didn't completely disappeared). A true rangefinder is a complex mechanical device which requires the utmost precise alignment for it's various components.
Unlike them, the mirrorless which uses the main sensor for composing/focusing (manual or with contrast detection AF) require just a loose alignment, less than a SLR. Please, do not insult the rangefinders by such comparisons.