Tom cats are capable of killing kittens.
If Tiger is neutered that is a plus, but that still doesn't mean that he wouldn't do it.
How old will your kitten be?
Take the introduction seriously and slowly.
Have them in separate rooms at first, and although you will see excitement do not let them meet right away. Exchange their beddings for several days.
At the last stages bring the new kitten in a carrier and allow Tiger to sniff him and be in control, after all it is his house, right
Also don't forget to put a drop of vanilla on the back of both of your kitties' necks to make them smell alike.
You could always change your mind about the kitten and adopt an adult cat from a shelter.
There are so many pros : with a kitten you'll never know what his personality will be like, whilst the shelter kitty will already have plenty of descriptions on his/her file.