I have been unable to find a quote that explicitly confirms any of the following information. [If I missed any relevant quotes, I'd appreciate it if you could post them.] If not, I think you have assumed some things based on the information we do have, and while they may be correct, there is no proof that they will be in the game. Here are the points in question:
Each of the dungeons and ruins are completely customized and unique, no one part of one dungeon will look like another.
What GI says: "
Even underground areas are rich in variation, from icy caves to forgotten crypts" (p. 48). Unless I missed something, that is the only time they talk about dungeon environments, and that sentence is definitely not enough evidence for anyone to deduce that every dungeon will be uniquely crafted...
[...] snow truly falls from the sky and lands on objects and builds up. So in theory if it snows heavily enough you may have to wade through snow or even have mountain passes blocked by avalanches.
What GI says: "
Snow falls naturally onto the stones and branches, appearing not as a present texture, but falling exactly as it would on the object given its shape and size" (p. 48). This does not mention snow building up; that is perhaps implied but not explicitly stated. And there is definitely nothing to suggest entire passes may be blocked by snow drifts... Again, it could happen but there is no evidence of that being the case at this point.
You gain perks as you get skill levels that give you bonuses like those in Oblivion, Daggerfall and Fallout.
The GI says that you gain perks for every increase in your character's
overall level, not for increases to
skill levels (p. 50).
All items have the same set stats, and all non-human enemies have the same HP and stats across all levels. Quest rewards are always the same. This makes it so it better than Oblivion's Level-scaling. NPCs are scaled in their equipment.
Random spawns out in the world are scaled (stronger enemies appear at higher levels), but weak enemies aren't written out of the system, just become less common.
I don't see anything about these quotes in the GI... AFAIK, the only mention of level scaling outside the GI article was Gstaff's post that said the scaling in Skyrim will be more akin to the scaling in Fallout than the scaling in Oblivion. If that is your only reference, it's definitely not enough to make the above conclusions. If you have some other source as well I'd like to see it.
It hasn't been confirmed that spells will have finishing moves but I can say it is almost certain to have finishing moves for spells.
Based on what?
85 unique spell effects, which is far more than most other TES games.
What GI says: "Pushing left from the main menu calls up your selection of magical spells — 85 in all if you're a dedicated collector" (p. 54). Spells != spell effects. Granted I highly doubt it means that there are only 85 total spells in the game; it most likely does mean spell types or spell effects. But we shouldn't assume that this is the case... [Clarified by Mr. Tissue Box.]