I saw Pentax on every one of the new DA lenses I looked at. The 70mm /2.4 (marked 2.4/70) reveals the name when the focus is racked out. The coating on them is called HD in place of SMC.
I would think it very foolish of Ricoh to dump the Pentax name on its high-end stuff, because Ricoh has never been the name on that level that Pentax has been (though Ricoh has made some nice cameras over the years).