There is another thread that has 28 votes that says "keep contact lists" but then their description has nothing to do with actual contact lists. AND it's marked "shipped" meaning it exists. But it does not.
We need contact lists, not just "filtering" by tags and save that filter. In V1 it's so nice to go into "communications" and go to "contact lists" tab and find my list I want to email to. I like that way more than filtering my database (even with a saved filter) then clicking email and going that route. I found a glitch with that when unchecking people I don't want to send to. No glitches with the contact list in V1. PLEASE BRING THIS ASAP!