Originally posted by Anvh Pentax still make the FA limited and some other FA lenses are still in production.
For digital there is DFA which also offically support FF.
there are some DA lenses that also cover FF pretty well, DA*200 for example use the same design as FA*200 beside some redisgns often the longer focal legths work pretty well. It's only the wide angle that are problematic.
Here are the FF compatible references of today's Pentax catalogue :
1- smc FA 20mm-35mm F4 AL
2- smc FA J 28mm-80mm F3.5-5.6AL
3- smc FA 28mm-105mm F3.2-F4.5 AL [IF]
4- smc FA J 75mm-300mm F4.5-F5.8AL
5- smc FA 31mm F1.8 AL Limited [Silver] & [Black]
6- smc FA 35mm F2 AL
7- smc FA 43mm F1.9 Limited [Silver] & [Black]
8- smc FA 77mm F1.8 Limited [Silver]& [Black]
9- smc D FA Macro 100mm F2.8 WR
10- smc D FA Macro 50mm F2.8
11- smc FA 50mmF1.4
12- smc DA55mm-300mm f/4-5.8
13- smc DA35mm f/2.4
14- smc DA*200mm f/2.8
15- smc DA*60-250mm f/4
16- smc DA*300mm f//4
+ never forget they can also "relaunch" production of any valuable other reference at anytime, as they did 2 years ago with 645D.
Of course, there would be need for new optical formulas with more SDM... but the collection is already quite rich for a succesfull launch !