I'll start.
1. I'd like to have more than one follower. It'd be way more fun if you can have your own small army.

2. Following up on the more follower idea, I'd like to be able to take over holds and sack villages with my small follower army. You'd give the command to attack the area and all of your followers will start to go on a rampage. To take over you would have to either kill the Jarl/Village Guard Captain or make them surrender and banish them. This could be a whole new questline where you take over skyrim with those awesome battles that you took part in during the Civil War questline. The more followers you have the better the chance of winning.

3. I'd like to be able to have 1h weapons and 2h weapons equipped at the same time. It would work like this: (since I'm on ps3 I'll have to explain with ps3
controls) You'd have a bow set as your two handed and 2 daggers as your 1h weapons. You would press L1 to draw your bow and then proceed as normal. When you put away your bow you could press R1 and this would draw your daggers and the combat continues as normal. But it wouldn't just be bows and daggers. You'd be able to use any 1h weapons (including magic) and any 2h weapon.

These are some of my ideas, what would you like to see implemented in DLC's and patches?

I want to see fat people. All of the npc's are either super skinny or muscular. Give me fat people dang it!

I want to engineer my own spells. I also want more spell effects and spell mechanics.
I also think that every combat form could use more depth and complexity.
Trajectory of arrows having relevance to damage.
Locational damage and relevant conditions rendered through it.
If alchemy differed more from magic effects and complemented stealth more. The current way it functions feels cheap.

Spell-combinations, and I guess seasonal foliage.

I'd love to see two sets of weapons equippable, especially if both appear on your character.

In future patches I'd like to see seasonal foilage, and spell making (might be better to intergrate that into a DLC as a small addition).

As for future DLCs, well, its somewhat pointless of discussing because Bethesda likely has them all planned already, and knowing them they'll expand on some vague and forgotten piece of lore instead of doing something we're all aware of.

There is an ongoing thread about this here...http://www.gamesas.com/topic/1401164-future-dlc-suggestions-not-dawnguard-thread-6/

more radiant quests needing completion before advancing through the companions "guild"

use that thread please, thanks