Only reason I know this stuff is because I have had an A1 for almost a year. We were all noobs at one point lol.
As for being rooted, you currently are not (though it is very easy to get do). The warranty is void as it is due to the removal of Rogers ROM but that can easily be reversed (not entirely sure how to get Rogers stuff back on but can easily find out if you want).
Black AT&T Motorola Atrix 4G
ROM: CM10 by Epinter
White Acer Liquid A1
ROM: LiquidNext 1.9.2 @ 998MHz by Suxsem, ThePasto