The gene for the tan pattern is dominant to the one for the self pattern. Since your broken is expressing the self pattern, you know it didn't inherit anything more dominant than self, the most recessive gene in its series. Since both of your rabbits are self-pattern colors, all of their babies will have to be self-pattern colors, so no tan-pattern colors (otters, martens) or agouti-pattern colors (chestnut, opal, etc) are possible. Blue is the result of two copies of the dilution gene, so you know this rabbit had to give the dilution gene to her offspring. Therefore, you know the broken has one copy of the dilution gene, and one copy of the gene for full color. The Siamese Sable is expressing full color, but you don't know - it might be carrying a copy of the gene for dilution. If it is, you could get blues or dilute versions of some other colors. Because there is so much you don't know, it's pretty hard to say just what could come from a cross like this - though what you get in the nest box may tell you a lot about what you can expect to see in future litters.