This is actually a relatively small launch, but a few things need to be announced anyway:
Any new moves that are now available to your Pokemon as a result of BW2 are now available for purchase. Ataro's fantastically awesome new Ultradex and a list of the new moves can be found here
Three new gyms will be added to Unova. These will be Aspertia City (Normal), Virbank City (Poison) and Humilau City (Water). Although this means Unova will have a total of 11 gyms, only 8 badges will be required for Elite Four challenges. This also means I'm looking for someone to make 16x16 pixel badge sprites for use on the gym page.
A new battling mode is now available. As discussed in Trainer's Court a few months ago, a mode was requested which would provide the freedom of D/P, without any predecided teams, but still send in private as per the Revolution battle modes. This will be known as BW2 because our naming conventions are awful.
A thread will be posted where you can claim a refund on any moves you paid for previously that are now available as a level up in BW2. This does NOT apply to moves which have had a price reduction, such as a $7,000 TM becoming a $5,000 BM. You're out $2,000, too bad.
The new legendary forms are now available. When you win the rights to a legend (eg. Kyurem), you must select which form it is in. It will remain in this form for the duration that you own it.
And, although this isn't a troll thread and everything I said above is totally legit: