yea make a rogue and stick with it, its the best and most rewarding class to play. if you can master it... oh my.
i have 3 tanks and a rogue lol warrior paladin and DK. the changes to DK for WoD where huge and very hard to get my head around. was made even easier, you no longer have an aoe and a single target rotation, its all just the same.
i cant get into my rogue as it was my free level 90 and tbh i skipped all the learning that comes from levelling up.
paladin always has a time in every expansion where it is OP, so i think i may stick with that this time around.
DK tank with 2h weapon makes levelling as a tank alot more fun. i just cant play as dps now, the survivability is awful and requires me to sit and eat/drink after every fight/mob.