I contacted Jim Owens at Jarheadtop.com by phone. He said that Kowa was streamlining their product line. They made the changes so that they could use the same eyepiece for more base models. Up to now, from what I understand the TSN821 series had eyepieces of their own, but now with the TSN82SV, it will accept eyepieces used in other base models. So I guess it's a business decision based on whatever sales models that KOWA has and uses. The new LER eyepiece offered is a 25X power as opposed to the old one which was a 27X power. The field of view of the new one is correspondingly wider than the old one, from what he told me.
It figures they would change the product right when I was planing on purchasing one!
Now I have to re-thing the whole thing over again.