It looks like Harman is trying to resurrect Lexicon now that the bad press from their $3500 recased Oppo blu-ray player fiasco isn't on the first page of search results.
Judging from the back panel, the hardware for the new Lexicon products is very similar to Arcam. But Lexicon offers something unique in their software: Logic7 to upmix music. I've never used Logic7, but online comments are positive.
I briefly had a review sample of another AVR based on the Arcam. I never wrote the review. I had to return the unit. Unlike Denon/Marantz, Onkyo, Yamaha, and Anthem, this unit could only render height effects to ceiling speakers and Dolby bouncers. On-wall front/rear heights were not supported. According to the current version Arcam AV860 manual, this limitation persists across their line.
If Lexicon addresses this limitation in their version, the Lexicon models might be the answer for people who enjoy upmixed music, but find Dolby Surround, Neural X, and Auromatic disappointing compared to Dolby Pro Logic IIx Music. People like me!
Also, Harman finds a way to incorporate anechoic profiles for JBL Synthesis compatible speakers such as the LSR705i and LSR708i into their Dirac Live implementation, then these products could be really special.
(Edited to reflect fact that Yamaha AVRs and SSP can also render Atmos to on-wall front and rear height locations.)