I think there are plenty of ways they learned from Oblivion. THere are plenty of things they've learned from Fallout as well. They've already commented on level caps. Beards showed in FO3. As Donner said, voice acting and uniqueness of location improved. Fast travel remains, although there are still those who like it.
The hints they've dropped indicate they are listening to us, of course it wouldn't be in their best interest to take all of our suggestions. Look at what happened to Attack of the Clones. That entire movie is basically fan service, yet at the same time, it is the steamiest monkey arm of the Star Wars saga. Beth will make a good game, we will like it, and we will be incredibly picky because we think they owe it to us to listen to us. Personally I don't want a game made by me, I want surprises, originality and beards.
Yes they listen to complains, Fallout 3 has put in lots of Morrowind's features even if it's a totally different game, mostly pre placed loot many places. One weakness is that you always swim down to rivet city after breaking into the sheriff house for the bubbleheads.
Some of the items like Lincolns repeater has a lack of ammo at low level who balance things out but it would not work in a elder scrolls game. Hide the good stuff better, like the way you could get the daeric sword in Morrowind by killing the guy at the Dren plantation. Or how you farm gatling lasers from the enclave outpost north of the location of the nuke cola quest.
One little but important feature in Fallout 3 is item condition. I wonder if that it leveled as you find higher quality items over time or location based.
Imagine Oblivion with the change at level one you run into enemies with iron weapons and armor in poor condition perhaps 10%, as you level up quality improves so at level 7 its perhaps 50%, new material are introduced manly at bosses who might wear some iron at level 5. Steel only start to appear on standard bandits at level 10 and little use for the standard bandits to go past silver. but at level 30 it would be 100% quality.
Now you have solved the level scaled equipment on bandits in Oblivion.
About level cap, I would hate it and mod it at once, much of the fun is levelling up.
Also totally unneeded from a balance point of view, how much more effective is a character who has maxed blunt and blade than one who has only maxed one of them, same for archery and destruction or light and heavy armor? Some as he has more equipment to choose from, he also has higher attributes, but the main benefit is that he has more than doubled his health, as endurance goes up he will gain more health for each level up.
Far better to restrict max health some way with a hard or soft cap, perhaps by starting endurance as fighters would need more health than mages. but mainly that at some point either level or number of hp, it stops or start raising very slowly.
This would keep higher level enemies a challenge without making every fight a slugging match.