They didn’t say what was wrong, but they cautioned recipients to wait for the new forms before filing. I’m also not sure if this e-mail was targeted to specific investors or if they sent it out to everyone. Either way, they’re promising that the corrected forms will be available by February 19th, 2013.
Also… If you’re the curious sort, you might be interest in this post on Lending Club and your income taxes from the archives. It’s a couple of years old but the information is still relevant.