That's a good thing. But I don't want to wait too long with the new Vim license, hopefully Vim 6.1 will be released soon.
If you're happy with GPL version 2, then you can make the license GPL-compatible now. Also, some software will still use the old GPL license. For example, the GPM library on someones system is likely to have the old GPL version for a while. If GPM says "version 2 of the GPL or any later version", which is what we recommend, then the new version will apply as soon as it is officially approved. (This is just like the statement you use saying that users can follow newer Vim licenses for older versions of Vim.) 3) A message must be added, at least in the output of the ":version" command and in the intro screen, such that the user of the modified Vim is be able to see that it was modified. When distributing as mentioned under 2)e) adding the message is only required for as far as this does not conflict with the license used for the changes. This seems to work.