It's a good sign that Wii U sales grew for last week without any major release. And it's quite early for the holidays, as new year is the most important for the shopping season and it's still one month to go.
Might be also some good word of mouth for Mario 3d World that helped also the console.
If it's the first case the sales should steadly grow until the end of the month. If it's because of Mario it might stabilize or even decrease a little before holiday effect steps in. Although Mario&Sonic launch might also have an impact.
It's not really early. We usually start seeing the year-end shopping effect in November. 3DS games have already been increasing for a couple of weeks now:
21./20. [3DS] Animal Crossing: New Leaf # <ETC> (Nintendo) {2012.11.08} (¥4.800) - 7.572 / 3.881.985 <80-100%> (+21%)
28./28. [3DS] Disney Magic Castle: My Happy Life # <ETC> (Bandai Namco Games) {2013.08.01} (¥5.480) - 4.943 / 318.062 <80-100%> (+35%)
29./31. [3DS] Friend Collection: New Life # <ETC> (Nintendo) {2013.04.18} (¥4.800) - 4.772 / 1.469.078 <80-100%> (+38%)
Wii U is having the same benefit as a Nintendo product (as many people repeatedly forecast). The bundles and SM3DW obviously aren't hurting it.