The login itself is not really new as it has been here for half a year or there abouts ever since we got "hacked".
We've had the news section and information posts about it posted on here, DA and tumblr, but sadly it has not been enough to reach out to all users and we probably lost a lot of players from it.
It is not possible to add popup boxes in the game as it requires the source code, the only thing we could do would be to add some text in the bulletin board next to the login screen in the game. Currently we have some patch notes there. Sadly it was overlooked to add in text about the login page as it wasn't exactly news and already been that way for months upon months, it's just that old players from before what took place might not know about it, and just dive in being confused.
People don't like to read very much.. which is a bit amusing as this game has a lot of reading in it xD
But to answer, not really possible, and we will most likely not repack the installer and make new downloads for a quick change in a text file for "old news". We might try to add it later if we'd have more reasons to repack the installer.
Thanks for the suggestion though.