The scrapped screen is awesome.
I don't remember the classic one and I've liked all the other ones (Sindragosa's loud breathing aside). I am not overly attached to a particular one, nor do I hate any.
It would be kinda cool if they used the new expansion screen for from patch X.0 to X.1 and then after that just made it random between all the ones they've made, including the discarded ones.
Then again, with the new launcher app, login screens might be a thing of the past anyway.