I know this is old, but this article was not vengeful and gives some really good business background from EAs perspective why they would not want to continue with the relationship with Nintendo and how they have put some effort into the relationship.
http://www.notenoughshaders.com/2013/03/25/the-sexual-history-between-nintendo-and-electronic-arts/I know it's easy to pick on EA because they don't always put alot of effort into ports and release sequels that sometimes are flawed. But let's bet honest here, they do the same things on other consoles and succeed. The initial PS3/Xbox 360 ports of Madden were way worse than the Wii U initial version. And they sold much better. That's the business rational for EA.
The vengeful PR actually has a business purpose too. Now that they've gone the route of not supporting the Wii U it would be better for them to not have the Wii U and whatever is on the Wii U competing for consumers money. It's a little outward and pretty unprofessional, but the Wii U is getting crushed in the media and this is just piling it on. So EA appears to be accomplishing their goal of at least limiting the competition that Nintendo provides.