If you mean which version, the changelog says version 2.5.1 in that release.
If you're asking if io.js is using a different npm, no it's using the same as Node.
You use io.js pretty much like "another version of node" which is why you'd use nvm if you want to have both io and node on the same system (same way you'd use nvm to have two versions of node on the same system) or just straight upgrade/replace, like replacing 0.10 by 0.12.
If you're asking if io.js is using a different npm, no it's using the same as Node.
You use io.js pretty much like "another version of node" which is why you'd use nvm if you want to have both io and node on the same system (same way you'd use nvm to have two versions of node on the same system) or just straight upgrade/replace, like replacing 0.10 by 0.12.