I follow Elon Musk on Twitter to try to get as many updates about the Falcon platform as possible. The other day this was tweeted:
F9R (pronounced F-niner) shows a little leg. Design is a nested, telescoping piston w A frame. twitter.com/elonmusk/statu…
— Elon Musk (@elonmusk) May 2, 2013
Anyone have any idea what this may be?