After alot of testing I can say that multiboxing in this game while possible will not be overly rewarding.

There is /follow /assist and /aid.
There is a macro system but you cannot write macros to cast spells, only to make use of slash commands, ie the ones above.
Software boxing wont work as far as I can tell, I was using two PC's and my vetra gear.
There is a lot of CC in this game, but more knockbacks etc, that leave you in control of your character but would screw up multiboxing.
There are alot of spell lag/ability lag issues that all seem server side/client side bugs - I have a 15ms ping to my server so its definetly not network latency.

I have cancelled my second CE pre-order and I'm going to just play one account. There are alot of great things about this game and alot of not so great things but its definetly an improvment over DaoC and more interesting to me than WoW.

Just my 2c.