I've noticed how often product lines are started and ended at Emotiva. They go for long periods of time with holes in their line up such as a flagship 2 channel pre amp. It's been a good three years with nothing but broken promises and missed dates on the XSP-1, XMC, and a subwoofer line that escapes me.
So don't wait for something from them said to be coming soon. Buy based on their curent products or look elsewhere as they also can be out of stock on something for months.
That being said, I owned an Adcom, and replaced it with an Emotiva XPA-3. At low to medium volumes, there was no difference I could discern.