Definitely looks like a tease of things to come to me. Instagram would be stupid not follow suit now. At any rate both should be available by May/June.
No way can they make an app in 3-4 months! Skype is in beta since 4 months with not a single feature added to it.
How can they make money:
"The company imagines partnering with brands or advertisers that want to show certain Snapchat users a glimpse of a new device, a preview of a new movie or a sneak peek of an upcoming line of clothing," The New York Times' Jenna Wortham writes. "Or, they say, they could show 'exploding coupons,' an image that gives information about a deal or discount that expires after a certain amount of time."
Read more: How Can Snapchat Make Money? - Business Insider