A price increase for the HDMI 2.1 models is expected for Arcam too. Looks like the new card will be 8 in, 2 out all HDMI 2.1. No confirmation on the bandwidth but uncompressed 8K needs at least 32gbps and I suspect these card will be 40gbps like most of this years products.
I was definitely expecting an increase. It was the fact that they're keeping both 2.0 and 2.1 models around which made me think that the increase might be bigger that people had been anticipating/hoping.