I'm not sure if it has any real significance but I have three seedlings (sown on May 28 of this year) that have three leaves to start with instead of two--I forget the correct term for these leaves, maybe cotyledons? My limited past experiences with seeds is that the plant will produce true leaves in triplicate from here on out....and strangely enough they are all from a batch of mixed Saudi arabicums. Also, I have one Yemeni arabicum seedling (same sowing date) that has FOUR cotyledons with two of them being fused together--the first photo shows this although it's slightly out of focus.
I also have two seedlings that appear to be albinos--or at least they are a very pale yellowish green....and they both seem to be doing just fine growth-wise. The second photo shows one of them, an S1/Golden Bell Thai soco, The other is a "Black Giant" arabicum. I'll try to get some better photos later this evening--my digital camera was just being obnoxious about focusing with sunlight coming in the window!