I would like to know this as well. So far, all I have come up with is emailing them to myself and then not saving them instead just keeping them in the email. The minute you save it, it just save a frame of the GIF as a picture that's worthless.
You can copy them from emails and paste them into text messages and they will animate in the message thread but cannot be viewed full screen like it does a picture. I'm guessing we won't have GIF support anytime soon.