Originally posted by zzeitg Something big? DFA 600mm f4....
No chance. You do not stop development of large aperture tele lenses for 10 years to pump out a f/4 600mm out of nothing. Also, this is the DSLR forum, not the lens section. Pentax lens portfolio does the job. A couple more lenses from the roadmap are really needed, other additions would be nice, but the f/4 600 will be a silver giant on eBay for a long time. ON the other hand, I would buy redesigned 500/600 lens.
EVF only would be a lame duck. Too many smaller footprint mirrorless cameras around and you would need to prepare a full set of lenses to go with it. It would on the other hand be nice to join forces with some mirror less system to mount existing Pentax glass and grow on the side of others - sounds like L-mount alliance and I do not see it happen. Think about Canon glass on Sony. No official alliance, but Canon shooters bought Sony so far.
A smart combination of EVF/OVF should be possible without too much effort down the road, all the glass keeps fitting and all new optical developments are still good for a long time.