On April 10, 2015, Elon Musk tweeted 2 photos of the Dragon spacecraft being prepared for the CRS-6 mission:
He said "points if you notice what's new". I'm wondering what is new about this Dragon?
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It's the Dragon logo! That's it! They changed it from this:
The logo was leaked to Reddit community /r/SpaceX a while back, and first appeared on the Dragon v2 test article. This is the first time it's making its appearance on a Dragon v1. My understanding for the change is that because Dragon v2 has no "wings" (extendable solar panels), they simplified the logo.
Also, don't be surprised if this is only one of a dozen or more changes in those pictures. It'll be the only public-facing change they'll announce, but SpaceX iterate on nearly every vehicle and rocket they make. There'll be a lot of other changes too.