New PMC i series?

I audition a set of PMC TB2+'s the other day and was impressed, really impressed actually. I would almost have bought them but now I see the "i" series is out but unfortunately there are none in stock yet where I live to listen too.

Has any one heard the new i series especially in the tb2 and is it really that much of an improvement over the already amazingly good + series?

I know its sometimes a strategy of all companies to so call "upgrade" their product so they can justify putting the price up. If this was the case I would just buy the + series and put the saved money into a better amp.