The security problem has been internally fixed and will be available in the next release
It's not just an alias for 'runas'. It seems to be able to configurably block user input for sudo'd commands, retain the existing environment, ditch it and open a new window, and remember that you've sudo'd in the last minute or so.
It brings up UAC instead of having you input the password
The OpenBSD devs published a mail about it. The irony here is how Microsoft would behave if anybody else copied their concepts, including the name. The treatment is never symmetric or reciprocal.