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Ok lets say an eldar IC on a jetbike joins a unit of tau suits with jet packs, am i right in assuming the unit still gets to do the assault move thing even if the two rules don't have the same name.

I would say so, they have exact same movements during assault

I know I have been adding a Farseer to my Tau squad

Yes; they can both make an assault move. Even if it were mixed a unit in 6th is no longer constrained to move at the speed of the slowest model

Ok with that said do i have to roll for both and make sure that each part of the unit follows it's own distance roll?

Probably - they are using their own assault rules after all. There doesnt seem to be a rules link between them.