I was part of the beta as well and I know a lot of people who have played CoX will compare the two as being City of Heros 2. A lot of the costume designs are very very similar. Yes they have expanded on it but again you can pretty well create your same costume you had in CoH.
Travel powers work the same as well, while you are in combat (on purpose or aggro while going by) your movement powers get hindered so you go to a crawl either forcing you to fight or get lucky and get out of aggro range so they run back.
Teaming up in the game is not really needed, and you can survive on only 3 powers for the whole game (your End building power, your single big attack and your AoE attack). Yes there are other powers in the game but they don't add much in form of tactics.
The other thing good or bad is that this is a different MMO where you will not have your tank class, your DPS and healer, everyone is DPS granted some powers higher up and switching your "mode" will allow you to tank or heal.