Blue ion cannon shots?
Somebody's been doing too much EU-acid! ;P
It's not like people can't tell that it's a "special" weapon, considering the special gun and the fact that they call it an Ion cannon which we never have seen before or since, and does all those electrical effects on the ship.
The SHOT isn't an electrical weapon, it's a bolt that disrupts the systems of the ship, shields, electronics, etc. like a turbo laser with an EMP warhead.
And please ignore that silliness in the Clone Wars cgi series with their "ion cannon" (which is nothing like either the one in ESB or the ones in the video games, which is where the blue stuff comes from).
Love the mock ups though... at this rate ESB:R should be done in time for the 40th anniversary! ;)
I personally think what this movie needs is more blood. It's unrealistic that Han slices open that Taun Taun and its guts just fall out like wet rice noodles. I'm thinking you could put in some of those "Kill Bill" style blood geysers there. It would really pay homage to the old Samurai movies that Lucas was inspired by, like Shogun Assasin.