Honesty is always the best policy; I have a level 78 Nord I've been playing on since release, and a level 40-ish High Elf I started about a month ago. As far as I know, we don't even know if it's an automated selection or not, so just sit back and wait. If they choose you, awesome; if not, you'll still be able to buy it in a few weeks.
I'm actually on my 6th or 7th character. I've spent well over 300+ hours in developing my characters (I almost literally
live Skyrim, but my stupid job interrupts it...

), but the two characters I am running now are only at 62 and 43 hours respectively. I told the truth according to the questions I was asked; "How many hours have you played this character?".
I don't know if I'll get picked or not. I also told the truth that these two characters have not completed the MQ or a bunch of other quests, but I still have every achievement from past characters.
I would hope they could see how much I live this game.
But I know that whether I get picked or not, I'll still be getting the DLC. I just can't stay away. lol

So I've told the truth as it applies to my only two current avatars, I just hope it doesn't screw my chances. lmao