(This issue should be moved to the appropriate component repo if this functionality is not part of wp-cli's core functionality, and closed if this has been fixed in newer versions of wp-cli.)

Consider the following command-line output from wp-cli 2.0.1:

$ wp help plugin install
You have version 2.0.1. Would you like to update to 2.1.0? [y/n]

The user appears to be running a help command. Why would wp-cli be asking to update an undefined something?

In this message:

• make it clear that this message is from wp-cli, not something that may have hijacked wp-cli's help function
• make it clear that wp-cli is asking to upgrade wp-cli, not a plugin or something else