Both of my girls had high VCI scores on the WISC at ages 7 and 8, but they present very differently. The only thing that I can say they had in common was early speech. Dd10, whose VCI scores were higher, did speak earlier -- putting two words together at 5.5 months whereas dd12 was only using single words at 6 months, but they both had pretty advanced speech as little people.
I've generally been told that high VCI correlates with school performance. If I only had my one older child, I'd believe that b/c she is a stereotypical high achiever. My youngest is a much more erratic student who really doesn't fit into a school setting well although I must temper that with the fact that she still does well (got the Presidental Academic Excellence award in 5th grade -- you need a reasonably good GPA, etc. -- is a mostly A student and did have all As on her last report card, passed the two tests -- MAPs and a 7th grade math pre-test -- required to subject accelerate in math in 6th grade, etc.). What I see, though, is more a child who has to squeeze herself into a hole she doesn't fit in in order to make that work.
I'd except high VCI to show up in different ways depending on where those strengths within VCI lie. Probably the child would have an advanced vocabulary although s/he may or may not use it regularly (my dd10 doesn't often b/c she is more interested in appearing "normal.") Probably the child would be able to understand plot lines and character motivations well when reading although s/he may or may not like to read (again, my dd10 isn't much into reading).
