At Dayton this year, as last, I asked about a replacement for the FT-847. Both times, I was told that some preliminary work had been done, but that it was on hold pending the launch of a HEO (or other) satellite which would generate sufficient demand for an updated rig. While the FT-847 was selling steadily, once the parts dried up it was judged not economic to put a new one on the market at the current demand. That answer is not inconsistent with the statement that there are no plans to bring one out now. I have found that with these sorts of questions, the answer depends on who you ask, how you ask, and whether you follow up.
Of course you can still buy a TS-2000 or an IC-910 new. And Flex Systems is closing in on bringing out their own integrated 2 m and 70 cm transverters which will make the Flex-5000 out of the box a full duplex satellite rig, with great flexibility for adding microwave bands. The TS-2000 has so much appeal outside the satellite community that it or something similar is safe for now. There are some rumblings of an updated IC-910 as well. So there are options still.
Alan WA4SCA