Depends on when you left. New con colors are:
Grey = Non-XP (at higher levels they are 20ish levels below you)
Green = Barely XP mobs (at higher levels they are 15+ levels below you, what Light blue used to be)
Light Blue = Lower, general xp mobs (5+ levels below you, except at very low levels)
Dark Blue = Primary XP mobs, 1-5 levels below you, so you get you the xp bonus for being within 5 levels of the mob.
White = Same level as you
Yellow = 1-3 levels above you
Red = 2-4+ levels above you
There is also a secondary con message for weaker mobs, see related thread on new con on this or next page (it was very recent).
Depending on how long you've been gone, TSS mobs are generally much tougher due to it being a newer expansion, although I found Blackfeather to be about the right 55 hot zone, compared to PoStorms at 60, which was a bit rough to duo at 55, but Blackfeather was o problem even with 2-3 mobs, although the mob dots tend to hurt when they land alot (War + Clr 55 level duo, with Slow + Snare procing weapons).
**** EDIT ****
Here's the
link to the thread about easier con mobs.
**************
Yther Ore.
Edited, Sep 20th 2008 12:07am by Yther