A new decentralized content network, "Yours", will be released soon. The network will be Bitcoin-based, with a lot of the same ideas that Steemit incorporates. You will be able to "tip" creators of content, and will earn rewards for tipping good content early.
This seems like a pretty big problem for Steemit. Since Bitcoin is currently a much safer investment then Steem, some users might prefer the new platform and abandon Steemit.
On the other hand, there are some major differences between the platforms. And since Steemit has been around for a bit longer, if "Yours" won't bring anything new to the table, Steemit might win out just by being first.
This is certain to get interesting, and I'll be watching closely.
More details here. This video was also very useful: