Recent weeks have seen a couple of high-profile titles, published by Nintendo, arrive on the Wii U. In terms of the UK market, Pikmin 3 arrived in late July while The Wonderful 101 landed in late August. It seems those releases contributed, with some others, to bring an increase in Wii U software sales in the UK in the past two months, but the results have still been modest.
NeoGaf user jvm, who contributes to Gamasutra, has collated data from media reports to put together software sales and revenue, with neither doing the Wii U a great deal of credit. There is an increase in July and August, though it is modest, while the 3DS has dropped since an enormous June, which was no doubt primarily driven by Animal Crossing: New Leaf. The Wii U is keeping company near the PS Vita, lagging behind the Wii and DS which, despite their sizeable userbases, aren't being actively supported to any meaningful degree.
The trend is a positive, and none of the releases of July and August can necessarily be regarded as major hardware sellers in their own right. Nintendo will no doubt hope that the upcoming The Legend of Zelda: The Wind Waker HD and the official price reduction will boost numbers, while there's a substantial lineup of new content on the way towards the Holiday season. There are games lined up that are suitable for enticing almost everyone, so we'll have to wait and see how the numbers evolve later in the year; we suspect October could be a big month for the 3DS, too.