Advice for Cold Weather Racing

So my first race of the season is coming up this Sunday, great huh? Well, it turns out that the weather will not be cooperating exactly. Expected weather at the start is low 40's with the possibiliity of some showers. Water temp in the mid 60's.

Does anyone have any advice for racing in these types of conditions? I imagine long sleeve top on the bike is a must, plus gloves probably. Also, for wetsuit, will I be good with my long-john suit, or should I go ahead and rent a full suit for the race (I've never worn a full suit BTW)?

Thanks for any tips. BTW, the race is the Kinetic Sprint in VA, for those doing it.