Next Gen replacement for McIntosh C2600 pre-amp

Hey guys - I am considering buying a C2600 pre-amp in the  near term.

Does anyone know when this particular model was introduced, and when it's successor pre-amp will come out?

Just thinking that I may hold off if a successor is imminent..

Others will likely chime in, but that chassis has been out for a few years.  I had a C2300, same chassis as C2600, and I bought that new about 4 years ago.  The C2600 has updates to support DSD and had new tube circuitry.  If I had to guess, the chassis will be in play for a bit longer and I think the C2600 came out about two ago.