I know I have to budget for some accessories to buy at launch, but I don't think we know everything that's coming out yet, or that we may want.
One thing I think we know is that the Wii U will need an SD card to accept Wii -> Wii U transfers. So, I think I'll just go ahead and buy a 32 GB SD Card before launch to get that squared away.
Another thing I'll be wanting is a screen protector. I always get one as a matter of fact for my handhelds, and I think it's wise for me to continue that policy on day 1 for the Wii U too...
But what else is there? I don't think I'll go crazy for all the multi-colored controller sleeves (like I did at Wii launch... every controller's a different color!), but maybe it would behoove me to invest in a Wii U headset?
Oog... and maybe I'll need to buy some Motion Plus dongles... I only have one right now, plus my Skyward Sword Golden Wii Remote Plus controller.
Also, isn't it a good feeling to see that Nintendo now does official licensing for accessories? It's probably nothing, but it does give me that extra tiny bit of security as a consumer to buy these accessories.