What game mechanics are introduced in Gen V?

Question

So I'm gonna make the jump from Gen IV (SoulSilver) to Gen VI (X&Y) as soon as they come out. What I want to know is, what are all the game mechanics that have been introduced in the Gen V games (B/W/B2/W2) in terms of adventuring in the overworld, catching PKMN methods, ways to interact with the overworld, trading, breeding, etc.?

Comments

Now let's see how many of these features get passed on to Gen 6...

I personally am crossing my fingers for Spiky-Eared Pichu (HG/SS exclusive). They better...

Answer 1

Seasons
Triple Battles
Rotation Battles
Dream World
Global Link
Wonder Launcher
Dark grass/ shaking grass/ bubbling water/ kicking up of dirt/ etc :p ( where wild Pokemon hide)
More lifelike overworld (such as curves to buildings)
PokeMart/Center combined
Pokemon sprites in-battle move
Pokemon changes color due to status ailment
Camera movement in battle
Battle/overworld music changes in certain conditions
Global Terminal
You can trade Pokemon from the PC box

EDIT:
Repels used outside of bag
Multiple use TM
Habitat list for Pokedex in B2/W2
thanks to the commenters :p

Source
Hope I helped :)

Comments

What about re-usable TMs? This is my favourite feature of Gen V :)

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And also Repels being continually useable without having to open your bag for every Repel (in B2W2). That feature was accompanied by a heavenly chorus.

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Oh yeah you guys are right! i forgot :p thanks :)

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Also B2/W2 added the habitat list, for those interested in getting absolutely everything.