John. That was such a key issue for me that I made inquiries. The information my dealer received that came from Meridian was as follows.

The main differences between the 808.2 and the 808.3 result from:
New design and improved oscillators
Redesigned digital clocks
Reduced RF interference

These changes were reported to improve jitter which in turn improves detail and imaging, what was also called “improve the audio performance by lifting detail and further opening the image”. You should also expect to hear improved timing, particularly in the low-end.

Let`s hope we hear this.

My suggestion is don't focus on just apodising, which was not present in the 808.1, because apodising is only part of the processing steps used by Meridian to improve the sound. Regardless, what I noticed and others write so positively about was especially the 808.2's beautiful clarity of the audio and the precise imaging and soundstage. It was a big improvement over the 808.1.