Back in the bad old days of WiiWare, developers constantly complained about how hard it was to turn a profit on Nintendo's download service, largely because you had to reach a certain quota of sales before you saw any cash. This — combined with Nintendo's apparent indifference to indie developers — made it almost impossible for the service to compete with the likes of XBLA, PSN and the iOS App Store.
However, Nintendo seems have to learned its lesson since then and is pulling out all of the stops to make the Wii U eShop as indie-friendly as possible. As a result, we've seen an influx of new developers and a flood of confirmed games.
This sudden upsurge of interest can surely be attributed to the fact that Nintendo offers developers a free Unity licence and allows them to self-publish — as confirmed by Retro City Rampage developer Brian Provinciano:
That's a pretty impressive showing from Nintendo, and illustrates just how keenly the company is chasing indie developers. Hopefully as the year progresses and we see more indie games on the Wii U eShop, the console will reap the benefit in terms of sales.