Looking at all the new products lately, it is very clear that Meridian is reusing their technology into new products.
818 looks basically a 808.3 with an hybrid OA08/OA18 card and no CD player. Some changes to the ID40 made yes. Changed power supply and voila we have a new product. (So the 818 is why the 808.2 'i' version did not appear as a 808.3i ? ... forward thinking by Meridian ...). Very clever because this is what the audio community wants and for Meridian also because they can sell 2 products instead of 1.
M6 looks very much based on the 3200. Different casing and some light in the top.