What's the point of this? Is it meant to be some kind of life lesson for kids?

Looks like it's mostly just to get some press for the forthcoming TV series, but it seems a fairly cynical way of going about it.

Here's the official statement from Kermit himself:

"After careful thought, thoughtful consideration and considerable squabbling, Miss Piggy made the difficult decision to terminate our romantic relationship. We will continue to work together on television (“The Muppets”/Tuesdays 8pm this fall on ABC) and in all media now known or hereafter devised, in perpetuity, throughout the universe. However, our personal lives are now distinct and separate, and we will be seeing other people, pigs, frogs, et al. This is our only comment on this private matter. Thank you for your understanding."

https://www.facebook.com/MuppetsKermit?fref=ts